Hey everybody.

I'd like to just jump in and ask a question about the ol' bVm7b5 chord that kicks off the back-cycling from lets say Gb to C or the other way around.

From one tritone sub to another (in this case the ones I've chosen) using the cycle/circle of fifths:


So, in this case: Gb-Db-Ab-Eb-Bb-F7-Cm7b5-F7-Bb-Eb-Ab-Db-Gb

Is this C (the flattened V chord of the key of Gb -which should be Db) spelled like a m7b5 tetrad making it C,Eb,Gb,Bb?

or am I not understanding this harmonization?

I suspect the latter.

I'm not "hearing" it, and am finding it hard to finger.

Any information would be greatly appreciated.

I'm new here too, so if this is the intermediate room, sorry if this sounds stupid.