PhonicMind - Make karaoke out of any song with AI powered vocal remover
ChordU - Extracts chords from any song, integrated YouTube.
Sight Reading Machine - Computer generated music for sight reading practice
Guitaa.com - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.