Keep an Eye on the Sky spans 1968 to 1975 and shows the progression of Big Star through selections from such studio precursors as "Rock City" and "Icewater"; music from Big Star's acclaimed recordings (#1 Record, Radio City, and Third/Sister Lovers); and relevant solo work by group principals Alex Chilton and Chris Bell, who formed Big Star in 1971 with bassist Andy Hummel and drummer Jody Stephens. The collection also uncovers a trove of unreleased demos, unused mixes, alternate versions of songs, and a 1973 concert recorded in Memphis.

In these 98 tracks you can hear what turned artists as diverse as Cheap Trick, R.E.M., and The Replacements into Big Star fans. Spotlighting the band's roots, the boxed set opens with several songs recorded before Big Star formed, including "Try Again," one of the first songs Bell and Chilton wrote together. Those early cuts are followed by Big Star's 1972 debut #1 Record, reimagined here using a mix of album tracks and unreleased alternate mixes of favorites like "Thirteen," "When My Baby's Beside Me," and more. Among the disc's rarities are "Country Morn'" (issued as a flexi-disc single by a Big Star fanzine), the demo for "I Got Kinda Lost," and an unreleased acoustic demo of Chilton singing Loudon Wainwright's "Motel Blues."

The lavish packaging for Keep an Eye on the Sky includes extensive liner notes, rare and never-before-seen photos, and insightful essays about the cult of Big Star and the band's history.