I have converted all my CDs to FLAC and I mostly listen to my music collection in stereo speakers instead of headphones because I find the sound more natural. I have built my sound system around the moOde audio software.
You can be root on GNU/Linux, you cannot on Windows or any other nasty proprietary OS.
As far as I'm concerned, on an AOSP device, a good client should be available in the F-Droid repository.