Cb is a major, spelled Cb, Eb and Gb. In Open G tuning (D2 G2 D3 G3 B3 D4) the easiest shape is x44444, which sits at fret 4, needs a barre across 5 strings at fret 4 and mutes 1 string. 12 positions for it are shown below, from the nut up to fret 11.
Notes and intervals
Note
Cb
Eb
Gb
Interval
1P
3M
5P
12 ways to play it
Ordered by how hard they are to fret, easiest first, one per position on the neck. Fret numbers are relative to the position marked beside each grid.
x44444sits at fret 4, needs a barre across 5 strings at fret 4 and mutes 1 stringx41404sits at fret 1, spans 3 frets, lets 1 string ring open and mutes 1 string989809sits at fret 8, needs a barre across 3 strings at fret 8 and lets 1 string ring openxx9879sits at fret 7, spans 2 frets and mutes 2 strings13111311013sits at fret 11, needs a barre across 3 strings at fret 11 and lets 1 string ring open911911013sits at fret 9, needs a barre across 3 strings at fret 9 and lets 1 string ring openx4444xsits at fret 4, needs a barre across 4 strings at fret 4 and mutes 2 strings444444sits at fret 4 and needs a barre across 6 strings at fret 4xxx444sits at fret 4, needs a barre across 3 strings at fret 4 and mutes 3 strings44444xsits at fret 4, needs a barre across 5 strings at fret 4 and mutes 1 stringx44401sits at fret 1, spans 3 frets, lets 1 string ring open and mutes 1 stringxx4444sits at fret 4, needs a barre across 4 strings at fret 4 and mutes 2 strings
Keys Cb belongs to
Cb is diatonic to 24 of the 96 keys this app knows, playing a different role in each.