Sam Rivers' second recording with his Rivbea All-Star Orchestra for RCA is similar to his first one in that he uses an impressive 17-piece band full of top avant-gardists to interpret the dense arrangements of his originals. The music, which is frequently atonal, has so much going on at times that it will take several listens to comprehend everything; it certainly does not lose one's interest! The only fault to this stimulating set is that the soloists are not identified. Although one may recognize the various saxophonists (Steve Coleman, Greg Osby, Chico Freeman, Gary Thomas, and Hamiet Blueitt) and trombonist Ray Anderson, most of the brass players will be more difficult to determine. This very adventurous music is remarkable in ways and well worth acquiring by free jazz collectors.