Karen Harrington, NCTM, maintains a studio with over thirty-five students in Tulsa, Oklahoma. A graduate of the University of Oklahoma, she is also a clinician and adjudicator and serves the Oklahoma Music Teachers Association as northeast district president. Karen is a coauthor of the Hal Leonard Student Piano Library Theory Workbooks. Karen developed the games for her company, Music Games 'N Things, Inc. from the needs of her students to enjoy, retain and use music theory.