Svatojanské proudy ("St John's Rapids") also called Vltavská víla ("The vila of the Vltava") is an opera by Josef Richard Rozkošný to a libretto by .

It was first performed, conducted by Bedřich Smetana, in 1871.Bedřich Smetana: letters and reminiscences František Bartoš 1955 "SMETANA PERFORMS A WORK OF HIS CONTEMPORARY, RICHARD ROZKOSNY I like to remember with what love and care Smetana gave my "St. John's Rapids" a send-off in 1871. This was our musical feast." It was performed another six times at the Národní divadlo in 1885, and thirty five times in total.

Roles Čeněk, Count of Libočany - baritonePipers Enzyklopädie des Musiktheaters: Oper, Operette, Musical, Ballet Carl Dahlhaus, Sieghart Döhring, Universität Bayreuth. Forschungsinstitut für Musiktheater - 1997 "Okt. 1871, Interimstheater, Prag Personen: Cenek z Libočan. Graf (Bar); Bořita, Förster (B); Julie, seine Tochter (S); Horymír, Bergknappe (T); Vltavka, Moldaunixe (S); Slavoš, Jäger (B): Lidka, Gespielin Julies (S)." Bořita, a woodsman - bass Julie, his daughter - soprano Horymír, a miner - tenor Vltavka, a vila (fairy) of the Vltava - soprano Slavoš, a hunter - bass Lidka, friend of Julie - soprano

Recordings The 1st Act scene of Čeněk, Julie, her father and chorus was recorded for Czech radio in 1987J. R. Rozkošný: Scéna Hraběte Čeňka, Julie a lesníka Bořity z 1. dějství opery Svatojanské proudy and released on a recital CD by Ivan Kusnjer in 2011.

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