Fb7 is a dominant seventh, spelled Fb, Ab, Cb and Ebb. In Ukulele (low G) tuning (G3 C4 E4 A4) the easiest shape is 1202, which sits at fret 1, spans 1 fret and lets 1 string ring open. 12 positions for it are shown below, from the nut up to fret 13.
Notes and intervals
Note
Fb
Ab
Cb
Ebb
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.
1202sits at fret 1, spans 1 fret and lets 1 string ring openx445sits at fret 4, needs a barre across 2 strings at fret 4 and mutes 1 string9111011sits at fret 9 and spans 2 frets7877sits at fret 7 and needs a barre across 4 strings at fret 79810xsits at fret 8, spans 2 frets and mutes 1 string1314014sits at fret 13, spans 1 fret and lets 1 string ring open9875sits at fret 5 and spans 4 frets13141214sits at fret 12 and spans 2 frets1314011sits at fret 11, spans 3 frets and lets 1 string ring open4445sits at fret 4 and needs a barre across 3 strings at fret 4120xsits at fret 1, spans 1 fret, lets 1 string ring open and mutes 1 string780xsits at fret 7, spans 1 fret, lets 1 string ring open and mutes 1 string
Keys Fb7 belongs to
Fb7 is diatonic to 8 of the 96 keys this app knows, playing a different role in each.