Mainstream Disco Funk excavates the obscure grooves of Bob Shad's label as it pivoted from jazz towards the dancefloor between 1974 and 1976. While Salsoul and West End claimed the spotlight, Mainstream's New York studio crew crafted proto-disco burners that now sound thrillingly raw, caught between funk's swagger and disco's pulse before the genre calcified into formula.

BBE's compilation rescues these rare singles from collector limbo, documenting how independent labels experimented with extended rhythms during that brief window when disco still belonged to the clubs rather than the charts.