Bb is a major, spelled Bb, D and F. In Ukulele (low G) tuning (G3 C4 E4 A4) the easiest shape is 3211, which sits at fret 1 and needs a barre across 2 strings at fret 1. 12 positions for it are shown below, from the nut up to fret 13.
Notes and intervals
Note
Bb
D
F
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.
3211sits at fret 1 and needs a barre across 2 strings at fret 13565sits at fret 3 and spans 3 fretsx10108sits at fret 8, spans 2 frets and mutes 1 stringx565sits at fret 5, needs a barre across 3 strings at fret 5 and mutes 1 string101010xsits at fret 10, needs a barre across 3 strings at fret 10 and mutes 1 string15141313sits at fret 13 and needs a barre across 2 strings at fret 133265sits at fret 2 and spans 4 frets710108sits at fret 7 and spans 3 frets71068sits at fret 6 and spans 4 frets321xsits at fret 1, spans 2 frets and mutes 1 stringx211sits at fret 1, needs a barre across 2 strings at fret 1 and mutes 1 string7565sits at fret 5 and needs a barre across 3 strings at fret 5
Keys Bb belongs to
Bb is diatonic to 24 of the 96 keys this app knows, playing a different role in each.