Music-specific Disorders

Musical disorders
disorders involving pitch, rhythm and melody, playing instruments and creating music.

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Amusia
Definition: inability to recognize simple tunes
aka: tone-deafness, tune-deafness, dysmelodia, or dysmusia

Symptoms and causes
congenital (genes) or acquired

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Acquired music agnosia
Definition: loss of knowledge; "inability to recognize pitch, rhythm, chords, and notes to the inability to discriminate and recognize familiar songs, and judge tonality, and reproduce musical phrases"

Symptoms and causes: commonly acquired; also result of bilateral infarction of the right temporal lobes

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Musical Hallucinations

Definition: perceptions of musical sounds in the absence of external auditory stimuli; also includes non-musical sounds (bells, whistles, sirens)

Symptoms and causes: psychiatric disorder, brain lesion, epilepsy, intoxication

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MORE INFO: http://en.wikipedia.org/wiki/Music-specific_disorders