Just adding to what others said, you won't miss your music collection if you use Google Music and have good enough internet. In my use case, I have found that a

Just adding to what others said, you won't miss your music collection if you use Google Music and have good enough internet. In my use case, I have found that although I have GBs of music collected over years, at any particular movement, I am listening to only very small subset of it. So what I have uploaded all my music to Google Music, and then made offline all the music I frequently listen; essentially the new albums I purchase and the older, favorite songs. It works well because T-mobile data speeds are fast enough, and only time I remember missing my music was when I was on a long 12 hour flight, and really wanted to listen to that one song, and taking out my laptop wasn't worth the effort.