C#7 is a dominant seventh, spelled C#, E#, G# and B. In Open G tuning (D2 G2 D3 G3 B3 D4) the easiest shape is x6646x, which sits at fret 4, spans 2 frets and mutes 2 strings. 12 positions for it are shown below, from the nut up to fret 11.
Notes and intervals
Note
C#
E#
G#
B
Interval
1P
3M
5P
7m
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.
x6646xsits at fret 4, spans 2 frets and mutes 2 stringsx63406sits at fret 3, spans 3 frets, lets 1 string ring open and mutes 1 string111091099sits at fret 9 and needs a barre across 4 strings at fret 9x66669sits at fret 6, needs a barre across 4 strings at fret 6 and mutes 1 string11101110011sits at fret 10, needs a barre across 3 strings at fret 10 and lets 1 string ring openxx3423sits at fret 2, spans 2 frets and mutes 2 stringsx1342xsits at fret 1, spans 3 frets and mutes 2 strings11131113015sits at fret 11, needs a barre across 3 strings at fret 11 and lets 1 string ring openx63606sits at fret 3, spans 3 frets, lets 1 string ring open and mutes 1 stringx66403sits at fret 3, spans 3 frets, lets 1 string ring open and mutes 1 stringx66603sits at fret 3, spans 3 frets, lets 1 string ring open and mutes 1 stringx69666sits at fret 6, needs a barre across 5 strings at fret 6 and mutes 1 string
Keys C#7 belongs to
C#7 is diatonic to 8 of the 96 keys this app knows, playing a different role in each.