A Single History: 1991–1997 is a compilation album by Unwound released on Kill Rock Stars. It contains tracks previously released on various 7" singles and multiple-artist compilations. "Crab Nebula" and "Stumbling Block" originally appeared on the band's 1991 demo tape. The fourth song is a reference to the U.S. government's secret MK Ultra brainwashing program. The "Negated"/ "Said Serial"/ "Census" 7" was the first-ever release on Troubleman Unlimited Records. "Plight" is a cover of a Minutemen song, from the tribute disc Our Band Could Be Your Life. "Seen Not Heard" is from a split 7" with Steel Pole Bath Tub; the song comes from the Repetition album sessions. Following an extended drum and bass-style intro, "The Light At The End..." features odd vocal snippets from a man trying to persuade some band to make upbeat, "tribal-sounding" aerobics music. According to a Kill Rock Stars Q&A from 1999, the cover art is a composite of photos taken by drummer Sara Lund on the band's overseas tours. The top photo is of St. Mark's Basilica in Venice; "the train in the middle is from Japan, and the nuns on the bottom are from a religious procession we witnessed in Trani, Italy."