Managed to get PS1 games running on my PSP, but music doesn't work. The PS1 games are a bunch of BIN files that I converted into a single BIN and then used
PSX Eboots not showing up PSP 3000 6.61 Infinity PRO | GBAtemp.net - The Independent Video Game Community
Parasite Eve (USA-PSN) PSP Eboot - CDRomance
Convert PS1 ISO's To PSP EBOOT! (Play PS1 Games On PSP) - YouTube
Chrono Cross (USA-PSN) PSP Eboot Download
How to Install Any PS1 Game On PSP For Free - Convert ISO/CSO To EBOOT & Convert EBOOT To ISO/CSO - YouTube
How to run the game in a PSP - ^Ripper's Anime Page
How To Convert .BIN PS1 Games To EBOOT.PBP Files & Make Official Live Bubbles On Live Area! #Vita - YouTube