Me too, I am rather attached to my mp3 player.
I have 20GB capacity and I've used about 2/3 of it, which is about 2000 songs, in a mixture of Japanese and English and a bit of German in the case of Rammstein! ;-) (I also have some Scandinavian and Italian artists on there but they sing in English... XD)
I'm not allowed to listen to music at work, though - which is 8 hours a day at least, hehe - and then when I get home usually the first and main thing I do is play instrument(s)... so it's not like I have music playing constantly. I play it when I'm doing something like drawing, house cleaning
sick: ) or sewing.