Why am I not surprised that you're a Pratchett reader?Music with rocks in.
Construct asks a tricky question. Defining the difference between rock and jazz is maybe even harder because the styles have borrowed from each other so much. Still, most of the time we know it when we hear it (as per Stan's approach). If the answer doesn't come straight away, then it's fusion
More than definitions, I'm keen on hearing these new sub-genres because blending styles gives us such a rich vein of creative possibilities. On the minus side, artists who blend styles can find it harder to get gigs.
My current band currently plays a range of things because we deferred the musical direction discussion until we played songs that seemed fun to play and decided what worked best for us as a group. Our guitarists said he's telling people that we play in a new genre called bluesjazzsoulrockfolk. At present there are no bluesjazzsoulrockfolk venues in Sydney so we're going to have that discussion soon to work out what opportunities are out there, what we are, and where we want to take it.
Ken, due to video restrictions at work (morning tea time) I can't check out your post too closely but looking forward to digging deeper