I could be harsh and suggest you place your existing music player / hi-fi / mp3 player on top of your DS. Or I could point you in the direction of an M3DS simply cartridge and then to the most poular thread on this board (M3DS Simply guide).
if you dont have anything constructive to post. then dont post. the ds and psp both have their strong and weak points.
I don't know about that. The strongest point of my psp is being a paperweight(haven't used it in about a year). I think the DS would serve that job just as well, but I am to busy playing games, to try it out in that respect. JK the PSP now plays movies very well and that is one(read only) thing the DS cannot do as well.