Fantastic kosmigroov band from the 70s based out of Philadelphia. Catalyst made 4 albums (this second volume collects the last two "Unity" and "A Tear And A Smile"). Instrumentation consisted of keys, sax/flute/obe, bass, and drums. If you are a fan of electric Miles and Mwandishi era Hancock you need to check these discs out. Bassist Alphonso Johnson split from Catalyst to join Weather Report. Highly recommended.