Do they all share the same tracks?

I currently have one music player, but if I was to buy another and have 2, they can share the same tracks right? You have to buy doubles or new ones?

I don't know. But I think so . I have never had 2 music players . But some tracks are tradeable . And if you put a tradeable track in a music player . then you can sell that track and it will still be playing in the player . So if you put a track in the player and you can sell it . I think can also put it in another music player . Maybe ... If you figure out the answer please tell me .I unfortunely Don't know the answer