"Sour Suite" is a song written by Burton Cummings and performed by The Guess Who.

[2] The song was featured on their 1971 album, So Long, Bannatyne.

Its lyric about being "back in 46201" refers to a zip code for Indianapolis.

Cummings took it from the return address of a letter sent to him by a female fan.

[5] The single's B-side, "Life in the Bloodstream", also charted, reaching #39 in Canada.