You buy a car because it you can fit your harp in it. The harp, which was ten years old, cost as much as the car, which was new.

You're singing hymns in church, and mentally doing the Roman-numeral analysis.

Non-musicians don't want to date you because, even though you're nice and good-looking, they don't know what you're talking about most of the time.

You consider buying a book of pieces for four-hand piano because sightreading them would be a fun date with your s.o.

You lust after someone who's not good looking and is thirty years your senior, because he plays really well.

You and your music friends don't even have to start singing when someone inadvertantly uses a phrase that reminds you of a song; you just look at each other and smile.