I am new to this android music purchasing! I purchased a tune from the play store using my samsung charge and after the purchase, the play store said it was added to my "library". Then I tried to access the tune and could not figure out how to do it, but I am assuming I should have installed the google "play music" app first. So, I installed the "play music" app, but the tune does not show up as part of my play list. So, where is it, is it lost? Help, thanks