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 per