Encore Music might be a bit more popular than Founders Nation. We know about 1 link to it since March 2021 and only 1 link to Founders Nation. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You might get in contact with a nearby university, professor or student organization that have relevant courses to get in contact with students or alumnis. Other sources for co-founders are startup related meetups or websites (e.g., founders-nation.com). Source: over 2 years ago
EncoreMusic(opensource) has a music recognize feature, but it doesn't work with music I tried. Source: almost 3 years ago
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Y Combinator Co-founder Matching - YC’s free online platform to help you find your co-founder
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud