Eric Whitacre's "Sleep - Live Vocal Practice Tracks" is a unique and immersive collection of live vocal practice sessions, released on October 1, 2012, under the Download Choral Parts label. This choral album offers a behind-the-scenes look at the meticulous process that goes into creating Whitacre's renowned compositions. Each of the eight tracks features different vocal parts—Soprano 1 & 2, Alto 1 & 2, Tenor 1 & 2, and Bass 1 & 2—allowing choirs and vocal enthusiasts to practice and perfect their individual roles in the piece "Sleep." The album also includes a full choir track, providing a comprehensive reference for the entire composition. With a total runtime of 33 minutes, this album is a valuable resource for anyone looking to delve into the intricate harmonies and textures that define Eric Whitacre's distinctive style.