I don't own Animal Crossing City Folk so I can't confirm, but some games uses sequenced music instead of streamed music. If this game uses sequenced music, it's a lot harder to get them out of the disc, basically you have a set of sound samples and something like a score that the game uses to generate music from these sound samples. As far as I searched, there's no documentation in how to convert them (I only found some format specification, but I may haven't searched enough). However, I think it's possible, I already saw a complete OST dump from Zelda TP (and Zelda TP also uses sequenced music), I just don't know how the guy managed to dump it...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
