I found an mp3 cd in rental car that the non-jewish workers would have thrown out had they found it. The regular price of a blank cd is probably around US$0.20 . The cd has on it alot of songs from one particular composer many of which i have not purchased nor do i intend on purchasing. Now that I have a cd with these songs in my possession I would keep/listen to them. Can I keep it and use it?
Yes, it would seem that in these circumstances there is no obligation of Hashavat Aveida [returning a lost item] and you may keep the cd.