Should maybe add some TODOs here if there are more stuff than we can make work with the SoundCloud search API. I'm thinking of things like:

- exact searches
- search specific fields like artist, title, album, year, etc.
- search for multiple terms (e.g. `{'any': ['foo', 'bar']}` returning sound files matching both 'foo' and 'bar')

If some of these features are not supported by SoundCloud, it should probably be documented in a docstring on the function.