Unknown until 2004 and unheard until now, these recordings by the John Coltrane Quartet are, as Sonny Rollins says in the liner notes, "like finding a new room in the Great Pyramid." Featuring the Classic Quartet - John Coltrane, McCoy Tyner, Jimmy Garrison and Elvin Jones - and recorded at the end of a two-week run at Birdland, the music on this album represents one of the most influential groups in music history both performing in a musical style it had perfected.