In reply to:

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They dont have copies of their own?

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Probably not. If you were going on a year-long bus trip all over the world, would you take with you a listing of every lyric from a forty year career? I'm sure they know the songs they have done often, but when they add a new song, it doesn't seem that out of the realm of possibility that they'd need to all refresh themselves on the exact lyrics.

GDE
get dukewhite to Europe
Twelve just wasn't enough!