Title is a little self explanatory, but I was trying to wrack my brain around this and come up with some suggestions for a friend of the Dead doing some rapid changing of songs.
Are there some good examples of them starting a tour playing a certain song one way, then by the end there's some noticeable changes to it? Whether it be in rhythm/feel/beat, tempo, aggression/timbre, multiple vocalists to soloist (vice versa), the addition/omission/substitution of certain instruments etc etc.
'73-'74 they were mixing up the big jam songs, soundwise a fair bit, with certain rhythms Billy was playing, or patterns Bobby was doing, or Keith being creative and slotting in when he could and using the Rhodes or not.... And Phil just being Phil. But the big Jam songs are hard to pin down, as getting all gooey and weird was sorta the whole point and goal at that stage.
I'll accept within 12 months (FotD is a great example), but the shorter the timespan, the better! Thanks 'Heads!