An ear for music

I've been reading Musicophilia - Tales of Music and the Brain by Oliver Sacks and learnt quite a few interesting terms:

1. Musicogenic epilepsy/Musicolepsia - epileptic seizures induced by music.

2. Amusia - profound impairment in recognising melodies and in pitch discrimination. The person is tone deaf.

3. Synesthesia - instant conjoining of sensations. One person may perceive individual letters or days of the week as having their own particular colours, another may feel that every colour has its own peculiar smell, or every musical interval its own taste. For example, Monday could be green while D major is blue.

4. Aphasia - damage to the "speech area" in the brain's dominant (usually left) frontal lobe - whether from a degenerative disease, a stroke or a brain injury, may produce expressive aphasia - a loss of spoken language. Damage to a different speech area in the left temporal lobe results in receptive aphasia - difficult understanding speech.

5. Dystonia - certain twisting and posturing spasms of the muscles. It is typical of dystonias, as of Parkinsonism, that the reciprocal balance between agnostic and antagonistic muscles is lost, and instead of working together as they should - one set relaxing as others contract - they contract together, producing a clench or spasm.