Keep An Eye On The Sky (Reformat)(4CD);

is a 4-CD, 98-song career retrospective box set from American rock group Big Star, released in 2009. It features 52 unreleased tracks: demos, alternate takes and live performances. As well as material from founder member Chris Bell's earlier bands Rock City and Icewater, it includes all titles (in many cases as alternate mixes or demos) from Big Star's first three studio albums.