>song is only in one key
Saddest chord: Am
Plebbest chord: A
Pleb but GOAT: G
Why would you even do this: E
I will suck your dick if you use this: C#m
the skill of the composer/songwriter is using key changes effectively and un-gratingly. semitone bass movement helps.
I often get lost analyzing my own pieces, too many modulations to foreign keys and weird chords... I usually just give up and leave it to musicologists to analyze after my death.