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UltimateGuitar.com - Learn how to play your favourite songs on guitar or ukulele
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
ChordU - Extracts chords from any song, integrated YouTube.
Guitaa.com - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
Guitar Dashboard - Open-source interactive music theory for guitarists.