OK, I'm behind the times as I haven't acquired my Pi 3 yet (:-)), but I've been trying to play mp3s and wavs on my model B (mpg123 or aplay) and they always stutter. I'm puzzled because I thought I'd done that successfully when I first got it; Csound was always too much of a load, but I thought a straight audio file played OK. And I played with XBMC then, too. Never found anything persuasive enough to use it more, but as I remember it worked. (Just running Raspbian with audio over HDMI. Rebooting doesn't improve anything.)
Using the GUI I found I had Kodi so I double-clicked on a file and tried that. Equally, if not more, glitchy, even though the animated background swirled smoothly... And is there any way to exit Kodi and get back to the original screen? I found the little 'switch' icon at bottom left, and clicked on the 'Exit' item it brought up, but that just killed the GUI completely and I had to reboot.
So have others played music etc though an original Pi? What might I be doing wrong?
(BTW, is there any "Process Monitor" for the Pi that shows the CPU being used by each process? I don't know of anything that might be hogging things, but it'd be nice to be able to check.)
Thanks,
-- Pete --