The Director of Keyboard Studies at Azusa Pacific University, Dr. Joel Clifft also teaches piano, music theory, accompanying and ear training courses. He has extensive international performance experience, appearing in 13 countries. In addition to his performances in the classical genre, Dr Clifft frequently performs in musical theatre, ballet, sacred music, jazz and popular music and works as a studio vocalist, performing for clients such as Universal Pictures, The Paramount Group and Dreamworks. As a software developer, he created the Music Theory Pro iPhone app. MTP teaches music theory and ear training using cutting-edge technology. To date, the app has received more than 130,000 downloads from over 100 countries. A complementary app, Music Theory Professor, was recently release.