Apostrophe (') is an album by Frank Zappa, his eighteenth, released on March 22, 1974 in both stereo and quadraphonic formats. An edited version of its lead-off track, "Don't Eat the Yellow Snow", was Zappa's first chart single, reaching position 86. Apostrophe (') remains Zappa's biggest commercial success in the US. It was certified Gold by the RIAA on April 7, 1976. The album also peaked at number 10 on the Billboard Charts, and would end up becoming Zappa's highest-charting album.
Continuing from the commercial breakthrough of Over-Nite Sensation (1973), this album is a similar mix of short songs showcasing Zappa's humor and musical arrangements. The record's lyrical themes are often bizarre or obscure, with the exception of "Uncle Remus", which is an extension of Zappa's feelings on racial disharmony featured on his earlier song "Trouble Every Day".
Apostrophe is widely considered Zappa's definitive work. Apostrophe (') (1974) and the preceding release Over-Nite Sensation (1973), recorded with the same group of musicians, are the subject of a Classic Albums series documentary from Eagle Rock Entertainment, released on DVD May 1, 2007.