Gbm is a minor, spelled Gb, Bbb and Db. In Drop D tuning (D2 A2 D3 G3 B3 E4) the easiest shape is 404222, which sits at fret 2, needs a barre across 3 strings at fret 2 and lets 1 string ring open. 12 positions for it are shown below, from the nut up to fret 14.
Notes and intervals
Note
Gb
Bbb
Db
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.
404222sits at fret 2, needs a barre across 3 strings at fret 2 and lets 1 string ring open4046xxsits at fret 4, spans 2 frets, lets 1 string ring open and mutes 2 strings70767xsits at fret 6, spans 1 fret, lets 1 string ring open and mutes 1 stringx07675sits at fret 5, spans 2 frets, lets 1 string ring open and mutes 1 stringx91111109sits at fret 9, needs a barre across 5 strings at fret 9 and mutes 1 string110111110xsits at fret 10, spans 1 fret, lets 1 string ring open and mutes 1 string1101111xxsits at fret 11, needs no stretch at all, lets 1 string ring open and mutes 2 stringsx971179sits at fret 7, needs a barre across 3 strings at fret 7 and mutes 1 stringxxx141414sits at fret 14, needs a barre across 3 strings at fret 14 and mutes 3 strings444222sits at fret 2 and needs a barre across 3 strings at fret 240422xsits at fret 2, needs a barre across 2 strings at fret 2, lets 1 string ring open and mutes 1 string44422xsits at fret 2, needs a barre across 2 strings at fret 2 and mutes 1 string
Keys Gbm belongs to
Gbm is diatonic to 24 of the 96 keys this app knows, playing a different role in each.