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John Mayer is not done changing.
The 37-year-old crooner started off by tuning his acoustic guitar, joking, "Most of the weird s--t I've ever said in my life was during the tuning."
"This is a song I wrote not long ago and I'll play it for the first time outside of my house. I think it's called 'Done Changing' or 'Changing' or 'I Am Not Done Changing,' he said, before he launched into his new, folk rock-sounding tune.