Prompted by this question from Stephen S.:
What is a good app for playing background music?
He got plenty of responses. Here the highlights:
Tabletop Audi
Syrinscape
Dndify
DMDJ
Ambient Realms
Fantasy Soundboard
Groovy (Discord)
Stream Beats
Ambient-Mixer
Epidemic Sound
And finally, Spotify
Here is a list of Spotify playlists you might find useful:
Overland Settings
General/Travel/Wilderness/Reflective https://open.spotify.com/playlist/5Dal47JLiMtg1huB85DEQe
General/City/Busy Town - https://open.spotify.com/playlist/0iC9WDTW1RxlynyCtI9zXC
King's Palace/Regal/Noble/Posh - https://open.spotify.com/playlist/3s6q3jJgmS2hPOksOK6aXc
Church/Shrine/Peaceful/Choirs - https://open.spotify.com/playlist/7emQXTzkhZ3jTRDUWR1NFW
Wizards Tower/Classical/Surprising - https://open.spotify.com/playlist/2hyY2iYRwjzMZtXtOMDXZM
Elven Lands/Feywild/Majestic - https://open.spotify.com/playlist/3BExVHC239QUifHdXwPeNu
Dwarven City - https://open.spotify.com/playlist/4sqXXHCoGgJiA2eHKwV9L8
Halfling/Shire/Celtic - https://open.spotify.com/playlist/4MdQhChLi3CWcW2m3Bhmq1
Gnome Village - https://open.spotify.com/playlist/2lOxqyLZ3suEJiFU7mXzxT
Desert/Tribal/Badlands/Wastelands - https://open.spotify.com/playlist/4CJtbhA7nmNfFw3VKoDBi0
Arctic/Mountain/Frozen Tundra - https://open.spotify.com/playlist/1mlDvm4IAFRZZrD8OegQaa
Western/Outback/Frontier - https://open.spotify.com/playlist/3WArZKhEP4aOL7LW9Ix7OM
French/Spanish/German/Italian/Romantic - https://open.spotify.com/playlist/7DfREz417VeYZVpuusZ72u
Other-Worldly/Dream - https://open.spotify.com/playlist/4v4CnqyPvma2RfoLKny4q5
Nine Hells/Terror/Dystopia - https://open.spotify.com/playlist/6YU0cD3NZ1B8WD6AW0PkXO
Scene Settings
Danger Suspense/Dungeons/Caverns/Enemy Territoy - https://open.spotify.com/playlist/40nShPZ7g03R7JIXeohiYN
Evil Suspense/Undead/Creepy/Tomb/Graveyard/Crypt - https://open.spotify.com/playlist/3fco0rrNvLpwTt0LOHbvJe
Adventure Suspense/Heroic Acts/Chase/Action - https://open.spotify.com/playlist/5VOChExkjKvlkcnkCpgXCa
Intrigue Suspense/Puzzle/Mystery/Dragon’s Lair - https://open.spotify.com/playlist/3Mb3oz4fLYOYiTd64Iz1XJ
Delving Deep - https://open.spotify.com/playlist/0N6Pfpz4dZie93Hkyzf2Br
Epic Suspense/Boss Room - https://open.spotify.com/playlist/5KqhFkFrI98KsacsNOrHdk
Events
Boss Fight/BBEG - https://open.spotify.com/playlist/34g2goSq63sV1AgNSEmFfZ
Hell Battle - https://open.spotify.com/playlist/0hVoVFkeaD34Wr8vCbG6y6
Uplifting/Inspiring/Happy Moments - https://open.spotify.com/playlist/5yLW2TzHLvmIgerTmJczLK
Sappy/Emotional/Romantic Moments - https://open.spotify.com/playlist/1zNTzVrLljLj75aXnkAlvX
Sadness/Loss/Tragic Moments - https://open.spotify.com/playlist/2ialHGHKmEjAK522BxXEfH
Works in Progress (<2 Hours)/Niche
South American/Latin- https://open.spotify.com/playlist/1fjS5fSLKTRHeFlOr6rxjR
Asian/Oriental - https://open.spotify.com/playlist/5TA0al0OadtCsWPVcQXeQE
Arabic/Middle East/Indian/Persian - https://open.spotify.com/playlist/3AZvJXgbm8SOdZAqYWgbx7
Russian/Eastern Europe - https://open.spotify.com/playlist/7cU6OkeR5gf0ykIXdcUSTT
Jazz/Big Band/Early Modern - https://open.spotify.com/playlist/4rdLqakxMHqg4O0UhUPpAR
Cyberpunk, Future, 80's, Synthwave - https://open.spotify.com/playlist/54IUIuyAdoMV4YJkaANVy9
Heist/Planning a Scheme - https://open.spotify.com/playlist/7s6D0fGwGX0KqFZBvFGpP0
Epics/Building Suspense - https://open.spotify.com/playlist/3E9ykatx4NLViW2ackh7IV
Ambient/Environment Sounds, No Music - https://open.spotify.com/playlist/53xlDUkBlBLYIRPU0BUpY6