The Violin Play-Along Series will help you play your favorite songs quickly and easily. Just follow the music, listen to the demonstration track to hear how the violin should sound, and then play along using the separate backingtracks. With the melody and lyrics included in the book, you may also choose to sing along. The tracks can be accessed online using the unique code inside each book and can be streamed or downloaded. The audio files includePLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right.