Just my opinion, but...

Broadly, pastoral psychedelia from the late sixties and early seventies (or more recent music that plays close homage to that sort of thing), often with a vaguely folky vibe and a folklorish or elf-tastic bent to the lyrics.

Classic examples would be The Incredible String Band, Forest, Dr Strangely Strange, Comus and Mellow Candle (though the last stray into folk rock territory). Contemporary examples might include the wonderfully and frighteningly prolific Kitchen Cynics

Gerald Van Waes' psychedelic folk homestead is as good a place as any to start.

Art, when are you going to bring out a joke book? Actually, on second thoughts don't answer that! ;-)