BOOKS ABOUT PERFECT PITCH AND EAR TRAINING
courtesy of www.perfectpitchpeople.com
The Perfect Pitch Ear Training SuperCourse 2.0 (8 CDs/ 8 cassettes)
This is the well-known Perfect Pitch Course. I know, both from my own personal experience and by regular email conversations with interested people, that the course undoubtedly improves hearing, even before developing perfect pitch. Whether it eventually develops PP is a more controversial issue. There has been some research at universities which shows that a significant proportion of the individuals that took the course developed the ability after some time. More studies are needed, however. It seems to me that the best thing one can do in these cases is to try the material for oneself. The time required by the exercises is not very much, and there is always the money back guarantee.
The new 2.0 version has much more material, and has been completely reorganized. To those familiar with the old version, you'll be happy to know that this one does not require you to look for a partner (although you can make use of one, if you have someone else with whom you can share the drills, since the course provides exercises suited for different situations). The redistribution of the material into 24 lessons is a welcome addition, making this course resemble (in its own way) the relative pitch one.
The Relative Pitch Ear Training SuperCourse (22 cassettes/41 CDs)
In my opinion, it's as (or even more) useful than the perfect pitch one (Burge says it is "the other flip of the coin"). It goes step-by-step: you can't jump to the next level (it's divided in five levels) until you don't pass the one you are in, and you can't pass until you do everything well. This way all you learn gets permanently fixed. For example, once you learn the Minor 7th interval, you can immediately recognize it in any song or piece. Highly recommended.

Bruce E. Arnold
Ear Training
One Note Complete Method

Bruce E. Arnold
A Fanatic's Guide to Ear Training and Sight Singing

Steve Prosser
Essential Ear Training for the Contemporary Musician

Elvo S. D'Amante
Ear Training
Volume I: Scale Forms through Six Basic Tetrachords

Elvo S. D'Amante
Ear Training
Volume II: Twelve Basic Interval Sounds to Master

Elvo S. D'Amante
Ear Training
Volume III: Capturing the Basic Chord Qualities
Elementary Training for Musicians

The Craft of Musical Composition

Principles of Orchestration

Donald Jay Grout and Claude V. Palisca
A History of Western Music

Norton Anthology of Western Music (2 volumes)
Donald Jay Grout
Volume one: Ancient to Baroque
Volume two: Classical to Modern

Norton Recorded Anthology of Western Music (2 sets)
Donald Jay Grout
Volume one: Ancient to Baroque (6 CDs)
Volume two: Classical to Modern (6 CDs)

John Backus
The Acoustical Foundations of Music

Mark Levine
The Jazz Theory Book

Ivan March, Edward Greenfield, Robert Layton
The Penguin Guide to Compact Discs