"Sister Ray" is a song by the Velvet Underground that closes side two of their 1968 album White Light/White Heat.
The situation is a bunch of drag queens taking some sailors home with them, shooting up on smack and having this orgy when the police appear.
Rock critic Lester Bangs wrote in 1970, "The early Velvets had the good sense to realize that whatever your capabilities, music with a simple base structure was the best.
Thus, 'Sister Ray' evolved from a most basic funk riff seventeen minutes into stark sound structures of incredible complexity.
The band agreed to accept whatever faults occurred during recording, resulting in over 17 minutes of improvised material.