In my case I always like listening to “A whiter shade of pale”, it always works.
Whiter shade of pale is beautiful
Dizzy Wright - Killem Wit Kindness
This song always helps me realize how being upset is really nothing more than a barrier to clear thought and working past differences. Great jam to boot too!
This might sound childish, but there’s an old EP of lullabies that my parents used to play and sing for me long ago. Decades later, I got a copy to play and sing for my own son.
It’s called Golden Slumbers: Lullabies From Near and Far (1956). It’s not available digitally and was never released on CD, so I ripped the EP and posted it to YouTube at the link above. It’s really relaxing.
Anything by The Midnight or by Gunship
Necromancing Dancing by bear ghost can lift my mood regardless of why I’m upset. but it usually 'Depends on what I’m upset about. I try to find a song that is about the issue I’m experiencing. It helps me better articulate why I am upset I guess.
Fade to black, Metallica usually.
Don’t Stop Me Now by Queen. No matter how bad I feel, it always makes me feel better, and it’s lively enough that it inspires me to channel that energy into somehing more productive than just venting.
A Warm Place by Nine Inch Nails
Debussy for me.
“Feeling fussy, listenin’ to my, Debussy-ussy, Tryna bring out the fabulous…”
Might be a bit odd of an odd one, but the theme that plays on your ship from Star Wars: Knights of the Old Republic II: The Sith Lords is a song that never fails to help calm me down.