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| | Absolute Pitch ear training software for learning perfect pitch |
 | | Having absolute pitch makes it easier for a composer or performer, especially of atonal music, to retain and hear complex melodies and harmonies in his or her head (Schoenberg mentions his ability in a letter; Boulez is well known for it). |
 | | Musicians with extremely good relative pitch can give results indistinguishable from those having absolute pitch, but they are always at a disadvantage in having to hear a reference tone, such as Middle A, first. |
 | | For any singer, it obviates the use of a reference pitch, and ensures that performing without instrumental accompaniment, such as in a barbershop quartet, doesn't risk a gradual sliding out of tune during a piece. |
| www.silvawood.co.uk /pitch-intro.htm |
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