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The Cmaj7 chord is the notes C, E, G and B. The usual shape is an open chord: x 3 2 0 0 0, from the low E string to the high E. The guitar above is set up with Cmaj7 on the R key: tap it or press R to hear it, then strum the strings.
Numbers are fingers: 1 index to 4 little
The same chord, higher and brighter
Play it as x 3 5 4 5 3, a barre at the 3rd fret. Switch the guitar's chord level from Standard to Up to hear it.
These share a key with Cmaj7, so they sound right together, and they're on the pads next to it:
All the chords: guitar chord chart. Songs to practice them: easy guitar songs. Tune up first with the online guitar tuner.