UNDERGROUNDPersonnel: Thelonious Monk (piano); Jon Hendricks (vocals); Charlie Rouse (tenor saxophone); Larry Gales (bass); Ben Riley (drums). Recorded at Columbia Studios, New York, New York on December 14 & 21, 1967 and February 14 & December 14, 1968. Includes liner notes by Peter Keepnews. This is part of the Columbia Jazz Masterpieces series. UNDERGROUND was the first Monk album in a decade to present new compositions by the artist. It is also the last