Perfect Pitch and Absolute Pitch
Perfect Pitch or Absolute Pitch is the ability to recognize tones without first hearing any reference tone. A person with perfect pitch can tell you whether a note is F, Eb, C# by recognizing the inherent quality of the individual tones. Perfect pitch differs from relative pitch. Many musicians have developed a good sense of relative pitch - the ability to recognize intervals. Few musicians have perfect pitch . http://www.vocalist.org/perfectpitch.html