50 Ways to Improve Your Improvisational Skills. Book & CD Package by Dennis Taylor, Steve Herrman. These books (available for alto & tenor sax, trumpet, keyboard, and guitar) are for players interested in learning how to improvise and how to improve their creative phrasing.
Keyboard: This method is divided into three parts: Melody From scales to arpeggios, from using licks, riffs and runs to playing outside, this section focuses on melodic strategies for improvisation; Harmony Whether comping or soloing, harmony is essential to improvisation, and this section covers it in detail; Rhythm & Style Swing, laying back, shaping your phrases with accents ... this last section puts the finishing touches on your improvisational technique. You'll learn approaches to working with and around other musicians, and you'll practice comping and soloing over progressions in various styles from rock to bossa nova to swing to bebop. The companion CD contains 44 full-band demos for listening, as well as many play-along examples so you can practice improvising over various musical styles and progressions.