Dude, are you from medieval times? [ That's got to be the only answer, right? People haven't not listened to CDs in.. well, it might as well be ages as far as he's concerned! But okay, she's a girl, so he'll bother to explain-- ]

It's all on this disk here. [ Taking the CD out of the case. ] You pop it right into this stereo system here and it plays the music. No instruments needed, it's all recorded on here.