Sister is the band's fourth studio album, released on June 1, 1987, through SST Records. This album marks a pivotal moment in Sonic Youth's evolution, blending their experimental roots with more structured alternative rock elements. Inspired in part by the life and work of science fiction writer Philip K. Dick, Sister delves into themes of identity, duality, and dystopia. The album's raw sound was captured using vintage analog equipment at Sear Sound studio, contributing to its distinctive sonic texture. While not a commercial success upon release, Sister has since been recognized as a seminal work in the alternative rock genre, influencing numerous artists and earning critical acclaim.

Tracklist:

Side A:
A1. Schizophrenia
A2. (I Got A) Catholic Block
A3. Beauty Lies In The Eye
A4. Stereo Sanctity
A5. Pipeline / Kill Time

Side B:
B1. Tuff Gnarl
B2. Pacific Coast Highway
B3. Hot Wire My Heart
B4. Kotton Krown
B5. White Kross