I've had a similar experience after a minor head injury, and thought I was losing my relative pitch (and since I sing, this was somewhat worrying). After some e

I've had a similar experience after a minor head injury, and thought I was losing my relative pitch (and since I sing, this was somewhat worrying). After some experimentation, I realized that I was hearing a slightly different pitch in each ear [1], and this had the effect of producing on oddly atonal perception of music (almost like a record playing at the wrong/inconsistent speed). It cleared up in a few days, but was very disconcerting while it was happening (especially as I was in the middle of composing a piece of music). [1] http://en.wikipedia.org/wiki/Diplacusis http://en.wikipedia.org/wiki/Diplacusis