it's a mod, not 100% Foss, but try ambient music mod.
this post was submitted on 21 Jun 2023
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That looks really interesting, thank you!
From my understanding the "what song is playing" apps/services essentially have a big database of music stored in a special hash function. When you record the music it converts it into a hash, then compares it to the database.
Could these databases and algorithms be open source? Absolutely. Would it be really hard or expensive to maintain the database distribution or hosting? Definitely. Would music rights holders allow an open source project to have access to their music libraries to put into the database? Probably not... I would think that the services that do this have big agreements with rights holders that open source would not be able to get.
Edit: fixed bad spoiler/cw syntaxUninformed copyright law speculation
IANAL, but a hash of music is not the music itself, something that can be converted to music, or in any way protected by copyright AFAIK. That being said, I think the rest of your comment is correct.
I'd agree about the database probably not being copyright, but I was more talking about getting access to the music to convert in the first place.
Even most of the Linux apps use Shazam or similar for the backend. Most everything you will find in that area has some proprietary components and I can imagine that being hard to avoid for something that has to interface with licensed content (the music)
Just use your Google assistant, it's pretty accurate and it even recognize humming. The keyword is "What's this song or What song is this/Recognize this song/etc"
Google Assistant doesn't meet the OP's requirements: it's not open source.
While i find Google Assistant better at finding music, it isn't open source and thus not what OP is looking for.
The closest I know is AcoustID but it's only worked with full song files when I tried it via the API and I'm not sure how well it would work with a bad microphone recording.