Yes, there exists such a key. It contains 6 flats. The notes are Gb Ab Bb Cb Db Eb F Gb. You read that correctly; it has a C-flat.
G flat
15 different key signatures exist. (no sharps or flats) = C major F sharp= G major F C sharp = D major F C G sharp = A major F C G D sharp = E major F C G D A sharp = B major F C G D A E sharp = F # major F C G D A E B sharp = C# major B E A D G C F flat = C flat major B E A D G C flat = G flat major B E A D G flat = D flat major B E A D flat = A flat major B E A flat =E flat major B E flat =B flat major B flat = F major
D flat major, or b flat minor. The flats are B, E, A, D and G, in that order.
The interval between B-flat and G is equal to a major 6th. Thus, if a song has been transposed from B-flat major to G major, it will be a major 6th higher.
A Major: A B C# D E F# G# A A minor: a b c d e f g a A-flat Major: a-flat b-flat c d-flat e-flat g a-flat
G Major
B-flat up to G is a major 6th. Or, B-flat down to G is a minor 3rd.
E Flat Major has 3 G Flat Major has 6
C major and A minor which has no flats or sharps, G,D,A,E,B,F#,C# major, E,B,F#,C#,G#,D#,A# minors which don't have flats, F,B flat, E flat,A flat,D flat,G flat, C flat major D,G,C,F,B flat,A flat, C flat minor
C major: no sharps, no flats F major: no sharps, B flat Bb (B flat) major: no sharps, B and E flat Eb major: no sharps; B, E, and A flat Ab major: no sharps; B, E, A, and D flat Db major: no sharps; B, E, A, D, and G flat Gb major/F# (F sharp) major: no sharps; B, E, A, D, G, and C flat / F, C, G, D, A, and E sharp; no flats B major: F, C, G, D, and A sharp; no flats E major: F, C, G, and D sharp; no flats A major: F, C, and G sharp; no flats D major: F and C sharp, no flats G major: F sharp, no flats
B flat Major G minor E flat Major F Major
G-flat major.