Guitaa is a free online music platform for musicians, that lets them find chords of any song of their choice on Guitar, Piano and Ukulele.
App:
Perfect app for musicians
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.
ChordU - Extracts chords from any song, integrated YouTube.
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Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
yalp.io - Automatic chords extraction from mp3 and YouTube