Bb7sus4 chord
Bb dominant seventh suspended fourth
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>G
Gb
G
Abb7
A
Bb
B
C
Db
D
Eb
E
F
Gb
G
Ab
C
C
Db
D
Eb4
E
F
Gb
G
Ab
A
Bb
B
C
Eb
E
Eb
E
F5
Gb
G
Ab
A
Bb
B
C
Db
D
Eb
E
F
A
Ab
A
Bb1
B
C
Db
D
Eb
E
F
Gb
G
Ab
A
Bb
3
5
7
10
The Bb7sus4 chord has the formula 1, 4, 5, b7 with notes Bb, Eb, F, Ab
The seventh suspended fourth chord is a variation of the suspended fourth chord, meaning that it does not have a third and sounds open. This chord can be used to prepare for a resolution down toward a third.