Music Theory - Key Signature Flash Cards - REVIEW Alfred's Essentials of Music Theory: Key Signature Flash Cards (Major and Minor), Flash Cards Cards – August 1, 2006 These exciting Flash Card sets include 48 key signature cards each. They use Treble, Bass and Alto clefs. They are organized into 6 sets and may be used with any beginning music theory course. Correlated with Essentials of Music Theory, Books 2 & 3, and Volumes 2 & 3 of the Computer Software. #flip #clips #review #productreview