C7 is a dominant seventh, spelled C, E, G and Bb. In Drop D tuning (D2 A2 D3 G3 B3 E4) the easiest shape is 212010, which sits at fret 1, spans 1 fret and lets 2 strings ring open. 12 positions for it are shown below, from the nut up to fret 14.
Notes and intervals
Note
C
E
G
Bb
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.
212010sits at fret 1, spans 1 fret and lets 2 strings ring openx35350sits at fret 3, needs a barre across 3 strings at fret 3, lets 1 string ring open and mutes 1 stringx323xxsits at fret 2, spans 1 fret and mutes 3 strings1010100110sits at fret 10, needs a barre across 3 strings at fret 10 and lets 2 strings ring open10108080sits at fret 8, spans 2 frets and lets 2 strings ring open575556sits at fret 5 and needs a barre across 5 strings at fret 51078080sits at fret 7, spans 3 frets and lets 2 strings ring openxx109110sits at fret 9, spans 2 frets, lets 1 string ring open and mutes 2 strings1413140130sits at fret 13, spans 1 fret and lets 2 strings ring openx131401312sits at fret 12, spans 2 frets, lets 1 string ring open and mutes 1 stringx151415xxsits at fret 14, spans 1 fret and mutes 3 stringsxx10986sits at fret 6, spans 4 frets and mutes 2 strings
Keys C7 belongs to
C7 is diatonic to 8 of the 96 keys this app knows, playing a different role in each.