A jam session is a relatively informal musical event, process, or activity where musicians, typically instrumentalists, play improvised solos and vamp on tunes, songs and chord progressions.
Jam session may also refer to:
Jam Session (1942 film), a short film featuring Duke Ellington Jam Session (1944 film), an American film by Charles Barton Jam Session (software), a 1986 software program for Macintosh computers for music creation and playback Jam Session (1999 film), a Japanese documentary about the making of Kikujiro Jam Sessions, a 2007 video game Jam Session (album)
See also Jamming (dance)