"I Used to Play" is a new series for adults looking to get back into playing their instruments of yesteryear, and will help jumpstart their memory and comfort with music. Its no. 1 goal is to get people re-acquainted with their instrument(s) by providing them with types of music they want to play, like pop, jazz, and classic tunes, rather than etudes.

Each book contains digital download audio files of complete performances of most songs, plus accompaniment-only versions. The digital download...