Baritonist Gerry Mulligan's pianoless quartet of 1952-1953 with trumpeter Chet Baker was one of the most popular groups of the period and an influential force on West Coast Jazz. Mulligan's interplay with Baker looked back toward the collective improvisation of Dixieland but utilized up-to-date harmonies. This four-CD set overlaps with a previous (and now out-of-print) five-LP Mosaic box. In addition to all of the Pacific Jazz (as opposed to Fantasy and GNP/Crescendo) recordings of the Mulligan Quartet (including the hit version of "My Funny Valentine"), this box has a few slightly earlier titles that find Mulligan gradually forming the group (even utilizing pianist Jimmie Rowles on two songs), tunes from live sessions in which altoist Lee Konitz made the band a quintet, the 1957 Mulligan-Baker set called Reunion, and an Annie Ross date from the same period (leaving out the numbers that have Art Farmer in Baker's place). Despite both musicians remaining active for over 30 years, Mulligan and Baker only teamed up again on one occasion, for a 1970s Carnegie Hall concert released by CTI. The consistently delightful music on this box (much of which is classic) is highly recommended for all jazz collections.