Help me understand this...

I "re-read" Herbie Herbert's interview from a few years back yesterday and it brought a few questions to mind. In the interview, HH states that SP had troubles singing the songs for the Bill Graham memorial concert and the band had to transpose them to a lower key. Then there is a paragraph that states that SP got the band together one other time after that, prior to TBF...for a rehearsal at which HH says that SP sang well and impressed the guys by singing the dirty dozen etc. This timeline seems a bit contradictory to me...what am I missing?
Couple all this information with the first-hand accounts of the TBF rehearsals / sessions at which SP definitely needed to sing some of the songs transposed down. All this makes me wonder if some days were better than others in regards to SP vocal range during this period. Also, if the band knew that the "dirty dozen" would have to be played in lower keys, why would they have been so pumped to tour again with Perry? I would think that they would be taking a serious hit to their collective "credibility" by risking things out on the road like that.
Thoughts?

Couple all this information with the first-hand accounts of the TBF rehearsals / sessions at which SP definitely needed to sing some of the songs transposed down. All this makes me wonder if some days were better than others in regards to SP vocal range during this period. Also, if the band knew that the "dirty dozen" would have to be played in lower keys, why would they have been so pumped to tour again with Perry? I would think that they would be taking a serious hit to their collective "credibility" by risking things out on the road like that.
Thoughts?
