The best alternatives to FindMySong are Jammcard, Stereofox, and Composing Studio. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
An open-source, easy-to-use music notation editor that lets anyone compose together in real-time. Just go to composing.studio in your browser, create a new session, and share the link with other musicians! No setup or installation needed.