Exclusions:
*didn't mention Merchant Gods, or summons, because they didn't impact 2 full playthroughs.
**also ignored some of the finer mechanical details because they were largely extraneous to understanding the material.
***story left sparser than possible to avoid a 2-hour slog of mostly irrelevant minutiae. For example, Danette has a whole backstory that's explored in greater depth, but ultimately doesn't do much to push the entire "rehabilitating Gig" thing, because the entire game is working towards that end organically regardless.

songs by order of appearance:
soul nomad - maize forest
soul nomad - BAD BOYS
soul nomad - jazzy glass
soul nomad - dark harp
soul nomad - god's reflection
soul nomad - december street
soul nomad - will you dance
soul nomad - wandering apparition
soul nomad - seasons past
soul nomad - echoing prayers
soul nomad - woody chips
napple tale - slow water
soul nomad - tow-color necklace
undertale - megalovania
soul nomad - desperado
soul nomad - magic man
kikou souhei armodyne - bgm #14
soul nomad - cradle blues
soul nomad - escape artist
soul nomad - forma lleya lisami
radiata stories - men's dirge
soul nomad - moon cradle
radiata stories - white town of scheming, night
radiata stories - calm melody
radiata stories - scarlet wind
silksong - shellwood
soul nomad - legends of the exiled
soul nomad - speed queen
soul nomad - deep piano
radiata stories - unknown and unnamed spot
octopath 2 - wildlands, day
soul nomad - drazil
soul nomad - magician's illusion
soul nomad - RED BOOTS
soul nomad - broken faraway dreams
soul nomad - shocking red
soulcalibur II - windshadow
soul nomad - levin
soul nomad - crash landing
soul nomad - rock'n rocks
soul nomad - for the glancing smile
soul nomad - crisis climax
halo wars - flollo
soul nomad - dragon's eye
soul nomad - deep-six
soul nomad - cradle march
soul nomad - cradle of the ivory moon
grimgrimoire - book of days
soulcalibur II - hubris reprise