Of all the volumes in the Mosaic Select series, this one, and the Big John Patton box, are the most satisfying, though for very different reasons. This one is a true collector's gem. For starters, all but six of the 31 cuts on this three-CD box are previously unreleased. For Hill fans who knew there was more in the can, this is a most welcoming find. The material here was completely composed by Hill and was recorded in five sessions between 1967 and 1970. The pianist and composer is found in three different settings, from trio to sextet and septet with some octet sides. The personnel here varies, too. The sextet sessions feature Hill with Bennie Maupin, Pat Patrick, Charles Tolliver, Ron Carter, and either Paul Motian or Ben Riley on drums. These are the earliest cuts here and they are solid as solid can be.