This is turning into a really informative thread - with a bit of structure, I think it would make a useful sticky.
Great to read about some of the more serious music apps for those who manage their own files, ripped CD's, etc. Glad pawdog mentioned Google Play Music. It really needs a better name, and Google has been slow to publicize its value and features, but it continues to get better over time. With Wi-Fi access, the entire library (30+ million tracks I believe?) is available on demand, play lists continue to improve, and you can cache any or all of your music / libraries / playlists on your phone, depending of course on the amount of storage you've got. I added a 64GB high speed Samsung SD micro SD card for my photos and music - rethinking that now, and probably moving to a 128GB card (love having this option with my DT2), which would let me have many thousands of tracks on the phone.
Having music cached on the phone, combined with noise canceling headphones (mine are PSB M4U2), makes air travel SO much better - minimal noise from the plane, and non-stop music that I choose.
Re: tagging music by hand - guessing that would get to be a bit tedious after the first thousand or so...
