Book excerpt: Published in 1992, The Complete Idiot's Guide to Music Theoryhas proven itself as one of Alpha's best-selling books and perhaps the best-selling trade music theory book ever published. In the new updated and expanded second edition, the book includes a special CD and book section on ear training. The hour-long ear-training course reinforces the basic content of the book with musical examples of intervals, scales, chords, and rhythms. Also provided are aural exercises students can use to test their ear training and transcription skills. The CD is accompanied by a 20-page section of exercises and examples.