I see now. Thanks for the clarification (and upvoted because of it). The phrasing I used does seem to imply that I don't think that it is a special talent, although that was not my intent. I actually meant that I can play music in my mind but not on an instrument, nor can I write music (I can compose short melodies in my head, however). I do greatly enjoy being able to listen to songs I know by playing them in my head. Playing them on an mp3 player is a bit higher fidelity, but requires charged batteries, so my ability does come in handy.

Probably a more accurate thing to say would have been that I can hear or compose music in my head, but I do not have the ability to play an instrument, sing, or write music (at least not currently well enough that I would be able to pass any kind of music test whatsoever). I tend to be fairly happy with what I have, actually. While I do compare what I have to what other people have, I am rarely dismayed by the comparison. One reason for this is that other people often have rather different utility functions than I do, so I tend to not be trying to maximize what they are.

I agree that it is highly useful to appreciate what you have. Especially since that will help you enjoy life and solve problems better than the things you don't have.