The best alternatives to musiXmatch for YouTube are Musixmatch, Lyrics Training, and utab Chords & Lyrics. 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
Musixmatch is the world's largest catalog of song lyrics and translations. The world’s largest lyrics platform - where you can search, enjoy, and share lyrics from any track, anywhere in the world.