Some of the sheer audacity of the playing and instrumentation on Jimi Hendrix "Electric Ladyland".
For example the opening melody of "The Burning of the Midnight Lamp" involved a twinning of Electric Harpsichord with Wah Wah Guitar!!
Also a few songs by Supergrass feature some smirk inducing ad libs - "Never Done Nothing Like That Before", "Coffee in the Pot" and "Whiskey and Green Tea".
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