Camp Jam Rock Solid Keyboards, Book & CD. Is perfect for all musicians- whether you are just starting out or you've been playing a few months, the lessons & exercises are not only fun to play, but are proven effective to get budding rock stars jamming right away! The " Rock Rhythm and Grooves" section covers everything you need to know about chord inversions & voicings, " Rock Chops" develops your skills by building knowledge & technique through scales, & " Rock Styles" includes tips & tricks.