The Session Bb Instruments Play along with the MP3s Or use the sheet music parts to build the band around you, use the piano accouplement parts for small performances or the complete accouplement band parts with Piano, Bass, Guitar, Drums. The Pack Lead Melody Parts are For Bb Instrumentation .Trumpet, Tenor Sax, Clarinet. The Session For Tuned Instruments This Pack Comes With 10 Playalong tracks, Funk, Blues, Pop, Swing, Rega, Latin, 7/8 Rock, Motown, Hip Hop, Ballard. Tracks 1 to 10 with Melody { Demo of melody and Solos } Tracks 11 to 20 { No Melody, Play to the written parts Melodys & Solos or Improvise your own using the chord Sheets, Your Session Pack comes with: PIano, Guitar, Bass Guitar, Drum Kit, Chord Sheets, So Build your own Band or Just Play Along with The Piano / full band parts only or MP3's Tracks. Great for Improvisation and event Performances