Undulation (album)

Undulation is a live album by the Sam Rivers Quartet, led by multi-instrumentalist and composer Rivers, and featuring guitarist Jerry Byrd, bass guitarist Rael-Wesley Grant, and drummer Steve Ellington. Consisting of a single performance lasting over an hour, it was recorded on May 17, 1981, in Florence, Italy, and was released in 2021 by NoBusiness Records as volume 5 of the Sam Rivers Archive Series.

The Rivers Quartet with this lineup also appeared on Crosscurrent: Live at Jazz Unité (Blue Marge, 1981 [1982]). Undulation is based on material selected from Rivers' massive recorded archives, which are curated by writer and producer Ed Hazell, who spent a year reviewing tapes with the goal of choosing the best recordings for release by NoBusiness Records.