I put my iso ROMs in the games picodrive folder, games pop up, but won’t load, what do I do?
It’s not enough info to help you. What roms (extention)? Which folder you put them? Which picodrive you using (standalone or retroarch core)?
@HalfBlood
You need to put bios files into home/cpi/apps/emulators/bios (if you using os 0.4 if earlier version into home/.config/retroarch/bios). Bios names should be as mentioned here: https://docs.libretro.com/library/picodrive/
If it won’t work for you then you should use standalone version of picodrive and put bios files into home/cpi/.picodrive
Alright sounds good thank you, where do I get the bios?
@HalfBlood
google it: sega cd bios
You need to rename files according to names in the link I sent (and don’t mess up with regions, if bios is US then it should be renamed “bios_CD_U.bin” and so on with other regions). And just test them all.
Yeah none of them work, it’s all good, I give up, thank you for helping out
try standalone version. It works…
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Yeah got it to work on Stand-alone, thank you 
Quick question, where would I put the audio files?
Same folder as iso file
Alright so for example just put all this together in a Terminator file, within the games/SEGA-CD? @podmaz
Yes, this is correct I think. I only have 1 game with mp3 and it have 1 file only, but it works for me. So, I think its correct.
Ok I made a file with the iso with mp3s but the music still doesn’t play
I suppose you need to have .cue file for game which includes music tracks info. But I just tried it and doesn’t work. Maybe somone else can help?
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I appreciate the honesty, but who do you think can help?
I’ve never tried it, but research indicates that it may not support MP3.
No mention of MP3 here:
http://docs.libretro.com/library/picodrive/
Seems to confirm that it doesn’t support MP3 (at least in 2013):
And yet, in 2012, someone supposedly got it to work with a cue (example in thread):
http://wololo.net/talk/viewtopic.php?t=14574
There’s probably more information out there just waiting to be googled, but that’s what I found in a few seconds. 
So, basically turn the mp3 files to wav?