Ear Training: Twelve Basic Interval Sounds to Master, Volume。Ear Training Course 2.1 The Major 2nd Interval Hear。Ear Training & Aural Skills, Part 2: Intervals。Ear Training Course 2.1 The Major 2nd Interval Hear。Elvo S. D'AmanteEar Training: Twelve Basic Interval Sounds to Master, Volume 2 (Book & 5 CDs)