To play a Cmaj7 chord we simply add the seventh note of the scale (B) to a C chord (C E G). Different key signatures have different notes, but the formula is always the same. 3. C7 (Image credit: ...

1. Block change: moving one shape These open-chord ‘block changes’ are where the same shape is used on a different set of strings to make a new chord. This means you can hold the shape as you switch, ...