Andrzej Włast (born Gustaw Baumritter; 17 March 1895 – December 1, 1942?) was a Polish lyricist, satirist, theatre director, and publicist. He was one of the most popular songwriters of the interwar period, a leading figure in Warsaw cabarets, and the founder of the revue theatre Morskie Oko. Włast wrote thousands of songs, including Tango Milonga, Jesienne róże, Rebeka, and Szkoda twoich łez, which were the greatest blockbusters of the Second Polish Republic. and is credited with coining the term przebój as a Polish equivalent of the German Schlager.

Biography Włast was born in Łódź to Szymon Baumritter and Salomea née Eisenmann. His father was a banker for a branch of the Imperial Russian Bank of Lodz (Bank Handlowy). He was educated at a private secondary school run by A. Jeżewski, in Łódź. On his mother's side, Włast's relatives included Icek Rabinowicz-Eisenmann, owner of a tenement house at Konstantynowska Street 5, where Włast was raised. He was introduced to cabarets and variety theaters in his hometown of Łódź, by sneaking into them, such as the theater Urania, owned by Teodor Junod, the father of the Polish film actor, Eugeniusz Bodo, secretly with his friend Julian Tuwim, a year older than him. The elegant atmosphere of the venues—the men in tuxedos, women in sequined dresses, and the spectacle of revue entertainment—left a lasting impression on him and inspired his ambition to pursue a theatrical career. Immediately after high school, he moved to Warsaw, where, as Andrzej Włast, a pseudonym that was made by Julian Tuwim, in his free time, he wrote a revue titled “Under the Walls of Warsaw”, which made his debut on December 20, 1914, at the Shareholder Theatre (preceding Tuwim's cabaret debut by a year). He also got a contract with the Teatr Wspólne (Participation Theatre) immediately after high school. He also studied Law at the University of Warsaw, along with History and Medicine from 1913 to 1915.

Twenty-year-old Andrzej Włast joined the 5th Infantry Regiment of the Polish Legions., in 1916. He would not go to the front, when it turned out he had literary experience, he was assigned to headquarters, to the Propaganda Department, where he organized cultural events, wrote propaganda posters and texts for the Polish Army, and organized cultural events.

The Legions were a unique formation, full of cultural figures. The young Włast made many contacts, which later helped him secure leadership positions in theaters. An ancedote about Wlast once said that, during a performance in the cafe "Adria", an instrumental performance of "Złociste chryzantemy" was performed. Wlast, who was reportedly irritated that the song had become a popular hit without being his own lyrical work, he spontaneously improvised and performed a parody version of the refrain, which disrupted the performance and caused a moment of confusion and scandal among the audience. The incident is further embellished in some versions by claims that the situation was not escalated due to the presence of influential generals connected to the Polish Legions, which helped prevent any official consequences.

One of Włast's first hits was the song "Vivat coalition!" from the patriotic revue "Vivat freedom" from 1915 – sung at the Miraż Theatre with great success as late as 1918 (after the revue's second premiere on November 12, 1918). During the war, as a young cabaret artist, he managed to appear at the Bi-Ba-Bo Theatre, after Julian Tuwim convinced him and Artur Szyk to restart the cabaret's activities in Lodz, and in May 1916 Włast became literary manager of Bi-Ba-Bo, for 11 days, launched his own revue titled Być albo nie być, and gave the green light to Tuwim's revue debut. In Bi-Ba-Bo, he also debuted the early satirical song Za 10 Lat, where Włast imagined the future of cabaret and included both himself and Tuwim (“Wim”). The joke was that artists would become fantastically wealthy and that a “Wim or Włast” would receive 7.50 for a song.

Apart from this, he appeared at Miraż, and Czarny Kot. On the 18th of March, 1918, at a meeting at the Café Udziałowa in Warsaw, he established ZAIKS, along with Julian Tuwim.

After the war, he collaborated with the Teatr Arystyczny (Artistic Theatre), Teatr Mały (Little Theatre), and Sfinks (Sfinks). In 1920, he began working with the best cabaret of the interwar period, , where he worked alongside cabaret heavyweights such as Tuwim, Hemar, and Fryderyk Jarossy. One of his greatest hits of this time period was "Uj, ta Wiosna!"

Włast was described as both shy and romantically inclined, and he wrote love poetry, though these efforts did not significantly advance his personal romantic life. It is said that someone told him that "his only chance at success in love", could be achieved through the creation or co-creation of popular songs, which he took seriously, despite already having written several patriotic and political compositions. Acting on this idea, he attempted to establish himself in the genre of popular music, including an early romantic song composed with Franciszek Plewczyński, which he reportedly offered to Pola Negri in 1921. Although Negri accepted and even performed the piece, she is said to have either ignored or not understood its intended romantic subtext. Following this, Włast focused on promoting other performers, helping to launch the career of Stanisława Nowicka, later known as the “queen of tango.”

During this time, he also published his debut and only book of poetry, "Serce tattooowane" (Tattooed Heart) (1923).

Andrzej Włast published the film column series Dziesiąta Muza (Impresje) in the trade magazine Ekran i Scena between 1923 and 1924. His criticism was impressionistic in form and focused less on plot analysis than on acting, directing, visual style, and audience response. Włast frequently criticized contemporary German cinema for excessive artificiality, overuse of spectacle, theatrical acting, and reliance on monumental sets and technical effects at the expense of realism. He also repeatedly expressed dissatisfaction with Polish film production, accusing it of weak scripts, stage-like acting, and low artistic ambition despite adequate financial and technical resources. In contrast, he praised American films for their narrative clarity, realism, restrained acting, and effective use of cinematic means. A central theme of his criticism was film acting, particularly facial expression and gesture, which he regarded as the defining elements of the medium.

Włast remained in Tuwim's shadow, intimidated by his reputation and by the artistic prestige of the capital, Within a short time, however, Włast established himself in the field of popular songwriting. As new musical trends became fashionable in Warsaw, Tuwim and Włast became acquainted with the popular tune “Bubliczki”, reaching Poland from Bolshevik Russia in 1926. Tuwim intended to write Polish lyrics for it, Włast completed his own version immediately after their meeting, drafting the text during a brief stop in a café for some coffee and bagels. He then quickly incorporated the song into the revue “Klejnoty Warszawy” (“Jewels of Warsaw”), allowing his version to reach audiences before Tuwim had finished his adaptation. As a result, Włast consolidated his position as a songwriter capable of rapidly producing material for mass audiences, adapting quickly to changing trends and theatrical demands.

In July 1927, he became artistic director of “Perskie Oko.” In reality, he—the author of the most popular songs—was invited to save the failing theater, which featured stars such as Bodo, Zula Pogorzelska, Konrad Tom, Loda Halama, and others. However, the audience, already small, kept shrinking.

“Perskie Oko” closed after two months. Włast took a risk: he opened his own cabaret, “Nowe Perskie Oko.” He rented another hall with a larger audience and better stage. In November, the new revue theater opened with the program “The Audience Has the Floor” and became a success. Because the owners of the “Perskie Oko” brand sued him for using the name, Włast changed it to “Morskie Oko.”

In 1927, Włast formed a writing and composing partnership with Henryk Wars, together they would write many hits. They would also collaborate on Włast's new stage, Morskie Oko, this time his own venture. At 3 Jasna Street (in the building formerly occupied by Perskie Oko), Włast created Warsaw's first proper revue theater, modeled on the lavish Parisian stage spectacles such as the Moulin Rouge and, above all, the Casino de Paris, which he frequently visited from 1926 (drawing heavily on their programs). Włast was not only owner, director, and producer of “Morskie Oko,” but also its leading author. At Morskie Oko, Wars and Włast also transplanted the latest styles from overseas, Włast was always ahead of competitors. Several times a year he visited Paris, studying programs of famous cabarets such as Casino de Paris and Folies-Bergère, and used his observations in his work. After his trip to America, including New York and Los Angeles, new dances appeared in “Morskie Oko”: Charleston, cakewalk, two-step, black bottom. Wlast's heavy success was also due to his connections. He was extremely connected, having people from Jan Brzechwa to Antoni Slominski to Bodo and Ordonowna collaborate with him frequently. He was also a stakeholder and a member of the board of directors in Gebethner and Wolff, Poland's largest publishing company, which also enabled him to continuously promote sheet music, and the literary director and a stakeholder of the Syrena-Rekord recording company, which was Poland's main recording firm.

The theatre was based in the former Perskie Oko premises, redesigned as a modern revue space with a large stage, orchestra pit, and technical infrastructure suited for fast-changing multi-scene productions, allowing for frequent programme turnover typical of interwar revue economics. Unlike more literary cabarets such as Qui Pro Quo, Morskie Oko operated on a commercially driven model with high production turnover, often staging entirely new programmes several times per season in response to rapidly shifting audience tastes. It became closely associated with the star system of interwar Warsaw entertainment, regularly featuring leading performers of the period such as Hanka Ordonówna, Zula Pogorzelska, Konrad Tom, and Loda Halama, whose popularity helped define the theatre's mass appeal.

In 1929, members of the Morskie Oko revue troupe undertook a private trip to Poznań without Włast's knowledge. He later criticized the journey as "crazy", and very poorly planned, noting that the round trip took around sixteen hours, leaving only about one hour in the city, and stated that it had been undertaken “in secret" from him. Following the fatal car accident involving actor Witold Roland, Włast remained involved with the theatre, commented to the press on the aftermath, and reported that Eugeniusz Bodo was deeply affected by the event, even fainting during a performance, while members of the ensemble were emotionally distressed. He also assisted with post-accident formalities, assisting authorities, delivering the body back to Roland's family, and represented Morskie Oko at Roland's funeral, where he delivered Roland's funeral speech, a very touching one.

The economic crisis reduced audiences, and in 1933 “Morskie Oko” closed. The main reason was the declining popularity of revue theater. Włast shifted to operetta, then film revue, then back again to theater under different names and formats.

Włast, however, was undeterred and launched another project that same year – the Rex Theatre at 18 Karowa Street. It staged revues and mixed programmes written by Julian Tuwim, Marian Hemar, and Włast himself, becoming a major success. Włast later left the theatre to organize the production Gwiazda areny ("Star of the Arena") at the Staniewski Circus, with his good friends Eugeniusz Bodo and Hanka Ordonowna.