Bash! (also released as Modern Mainstream) is an album by jazz drummer Dave Bailey which was originally released on the Jazzline label in 1961. Different releases of the same material have appeared under the names of sidemen on the date. The album features pianist Tommy Flanagan and was re-released as Tommy Flanagan Trio And Sextet on the Onyx label and on the Xanadu label in 1973. It was also re-released under trumpeter Kenny Dorham's name as Osmosis on CD in 1990 on the Black Lion label with 4 alternate takes.