I Used To Play Clarinet book and CD. If you have ever played the clarinet before, you remember how much fun it can be to make music. Isn't about time that you dust off that old instrument and revisit those good times by relearning to play again, That's what I Used To Play is all about. First and foremost, this book is meant to get you reacquainted with your instrumet by providing you with the type of music you want to play. The book contains a wide variety of songs in varying styles.