Soundsystem is the fifth studio album by 311, released on October 12, 1999.

Recording processes for the album began on March 11, 1999.

"Soundsystem" was met with mostly mixed reviews from critics, with Rolling Stone discussing their mix of various genres, commenting "they offer their most ambitious fusion yet -- each track is a whirlwind tour of their soulful influences.

Alas, the ingredients usually refuse to mix in 311's hands, resulting in disjunctions that veer between the bland and the unintentionally funny".

[7] Credits adapted from album’s liner notes.