This question is very difficult and I dont know if its, but some one know if its posible to something in your game that you can drag only songs in the folder were you have all the songs(out of unity)into the game(during the game is playing) or maybe a little more difficult, how to make something that when you clic it appears the folders and all that stuff were you have all the songs(out of unity) so you can choose the song you want to put in the game and when you stop the game the song you choose it appears in the project.
Really, please if someone know how to do it or you know a different wy to do it please tell me I really need different answers.