Copying the text of an ask I answered a few months ago for you, anon!
Ambient Background Sound
- A Soft Murmur – my personal favorite ambient mixer. It has several sounds to choose from, adjustable volume for each, saved mixes, and a randomizer!
- Rainy Mood – constant rain!
- Coffivity – coffee shop/cafe sound background noise.
- August Ambience – summertime outdoor sounds
- Blazing Logs – a fireplace
- Ambient Mixer – I love this one because you can make your own mixer or use one of the existing ones, which include such gems as Gryffindor Common Room, On a Ship at Sea, and Mr. Tumnus’s House!
Music
- Spotify – specifically mixes by this user! (I like to find my favorite soundtracks and hit “Go to Radio” and then I just save songs that aren’t too distracting to mood-appropriate playlists.)
- 8tracks
- Pandora
- Soundcloud
- Youtube’s Free Music Library
- Bandcamp
And of course, I would be remiss not to mention Tabletop Audio. This website has soundscapes, music, mixes of both, all sorted by category! It’s an amazing resource. There’s also Battlebards if you don’t mind paying for the resource.
Lastly, a funky bit of background sound that’s good for weird places and situations might be Listen to Wikipedia. I also have an audio tag.
Hope that helps!