Now that things seem stable after the big sceAtrac upgrade and the closing of #20125, let's list remaining music problems here (that were broken before, and the new implementation doesn't fix):

• [Savestates]Loading a savestate in Fate/Extra CCC breaks BGMs. #11205
• Kosmodrones v1.02 (homebrew) missing ingame music #9067 (sceAudioCodec used directly to play AAC, so not really sceSas)
• Custom music (using sceMp3) sometimes plays at the wrong pitch #20250 (missing sample rate conversion in MP3 player)
• Loco roco 2 - Mui Mui house music doesn't play. #8647 - it spams the log and fails to loop, but does somehow play for a bit.
• Audio popping/cracking in left audio channel on every item pickup in Monster Hunter Freedom and Freedom Unite #19640
• Mega Drops 2 (see below)
• Tony Hawk Project 8 - music broke (Tony Hawk's Project 8 Soundtrack features disabled after update #20775 )
• Beats - Couldn't see/load mp3 files, now they're choppy #14812
• Beats / Shouten Beat - Can't load original soundtrack songs #20658 and Beats plays custom ATRAC songs when it should reject them #20677 (the two are related)
• Crazy Taxi: Fare Wars Custom Music issue #15509
• Dead or Alive Paradise audio bug #8672 -- takes very long for any song to start playing
• Digital Comics Music Player issues #20784
• GTA Liberty City Stories no longer plays custom AT3 music #20692

Misc:

• Audio queueing is not optimal #20095
• bug in SimpleAudio::Decode ffmpeg logic (resolved, now minor glitches instead) #18895

New MP3 test for future work: hrydgard/pspautotests#238