Free mp3 apps on android legal?

Are those apps that i see on the android market a.k.a. the google play store legal? I haven't downloaded any of those free mp3 apps because i wanted to know if they are legal or not? It doesnt say anything on the app details that its illegal but then again it doesnt say if its legal... So what im basically... show more Are those apps that i see on the android market a.k.a. the google play store legal? I haven't downloaded any of those free mp3 apps because i wanted to know if they are legal or not? It doesnt say anything on the app details that its illegal but then again it doesnt say if its legal... So what im basically asking is are those free mp3 apps such as music paradise, free music download, etc. Legal? Or illegal? Thanks so much :)
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