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[hiorgos]

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[jrmy]

Maybe something that starts out as a typical song, but could readily be stretched out to give you space to jam out in the middle. First thing that came to mind was Sabbath, but anything with a bunch of riffs could do the trick. Heck, maybe Hawkwind would be a good choice - they had the heavy riffs AND the spacey-freakouts.

[D.o.S.]

Become one with the oscillator.

[dubkitty]

"Interstellar Overdrive," yo.

[coldbrightsunlight]

I'd play some Sabbath, Kyuss, Sleep stuff because that's sort of metal-y music that I like, to try to bridge any gap (though he might like tons of other stuff, I don't know the dude). But jamming off some metal-ish music you both like could be a good starting point?