I've come across music that has a "G+7(♭9)". At first I thought this was just an odd way of writing G7(♭9), however there IS a G7(♭9) chord in the song as well. I feel that since they're named differently, they must have some distinction, but I don't know what.
I know of add9 chords, which are essentially 9th chords (1, 3, 5, 7, 9) without the 7th (1, 3, 5, 9). My best guess is that a +7 chord is a 7th chord without the 5th. Any help?