About the difference between VAMPS and HYDE Solo... somebody said it earlier xD It's just a transition, a change of name from when KAZ started actively helping Hyde and participating more and more...

Technically, HYDE ends with Faith, but all of HYDE's songs are still VAMPS. As in, HYDE experienced a change of name into VAMPS because of KAZ's active participation, to have KAZ as an actual figure or part of the band and give him credit, rather than just see him as supporting guitar to the leading vocals of HYDE... do you follow me? xD

But following this line of thought, basically VAMPS is entitled to playing all of HYDE's songs... only they tend to play those in which KAZ started participating and got more involved, get it?

They do from time to time play songs from when KAZ hadn't started playing with HYDE yet, but they are the lesser part of lives because, obviously, VAMPS sort of focuses on those songs that KAZ participated more actively in.

Also, as someone else said, they seem to be playing some of HYDE's songs simply because they are lacking in VAMPS songs, and probably now that BEAST is coming out we'll see less of HYDE era and more of VAMPS during the lives... though they will still probably play something from the time when VAMPS was still only HYDE xDD

And YES, Hyde DID say that they make music thinking of what would sound good live, and not thinking of the CD or the recording stage. He also said that he didn't really like the whole recording part of the songmaking and would much rather just go right into playing lives... but that in order to play lives, first they needed new songs, and for that reason he'd endure the recording process xDD I think I got that from an interview they did on musicJAPANplus or something, if I find it I'll quote it xDD

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EDIT!!

Found the short interview xD It was the last of a series of short questions and answers that they did on musicJAPANplus back when VAMPS was on their USA Tour 2009 ;D
This dates from about July 15th, 2009 (or at least, that's when I posted it on VAMPScene and translated it into Spanish for everyone to see xDD)

Quote:Keyword Talk Between HYDE and K.A.Z #6 ‘LIVE’

The VAMPS U.S. tour is reaching its midway point! This is our 6th daily article of the discussions between the duo, and sadly our last! For our final update the keyword is ‘LIVE’, a fitting subject for the two who are currently on tour.

☆LIVE☆
HYDE: “We make albums so we can go on tours. Even though I don’t want to, I have to produce albums. Or else I won’t be able to perform new songs during the tours.”

K.A.Z: “Well of course concert tours are more exciting than studio recordings (laughs). In tours, we get to do things the way we want to without any obligations. It’s cool how everybody is just minding their own business…like people visiting a zoo (laugh).”

VAMPS have been performing LIVE across America, and each of their LIVE concerts contained all the elements they have been talking about: PUNK, HUMOR, FREEDOM, NAUGHTY, and UNCONVENTIONAL. musicJAPANplus will go on covering VAMPS as they continue to reach new heights!