8-track
8-track or eight-track may refer to:

8-track cartridge, an analog magnetic tape format used for consumer audio distribution from the late 1960s to the early 1980s
8-track, an eight-track reel-to-reel magnetic tape format used for multitrack recording in professional recording studios
8tracks, an online site for user-generated mixtapes

See also
8-Track Flashback, an American television series broadcast on the VH1 network
ADAT, a magnetic tape format used for the simultaneous digital recording of eight analogue audio or digital audio tracks
Quadruple track, a railway line consisting of four parallel tracks