Freak Me Out

The Boredoms are exactly what you want.
They're Japanese. They use every sound they can produce by any means. Very loud, pretty much insane but still coherant.
Of what I've heard, I'm most fond of the CD Super Are. What I've heard of their latest, Vision Creation New Sun, is more electronic and jungly.

The Group is called "YELLO" , Cd is "One Second".Everyone is familiar with one of the later tracks but the entire disc has great depth,effects,imaging,and very unique instrumentation.Also check out a CD called "Spies,Music of Espianage".Both are a tremendous work out for speakers and need lots of power to convey their weight.

A cd from DHM label called ' Mythomania- songs of witches, fairies and ghosts'. A great find in terms of being different classical and at the same time EXCELLENT recording. If you are in to classical you will love this CD. Singing is what will freak you out.( and not because it is in GERMAN)

As far as jazz goes, the Sun Ra suggestion is a good one...so is Ornette Coleman, and some of John Coletrane's later stuff...especially "Ascension".

Captain Beefheart and Johnny Dowd are both good suggestions, though you may never get used to Johnny Dowd's voice. For a real freak show, check out The Shaggs. Todd Rundgren's "A Wizard A True Star" is a goodun', but not necessarily a great recording (recorded in 72 with lots of tracks). Neutral Milk Hotel and Giant Sand are also worth checking out. NMH is a bit lo-fi, but the last Giant Sand album ("Chore of Enchantment")is really recorded pretty well. Beck's "Mutations" is interesting, but mellow. The Flaming Lips' "The Soft Bulletin" is pretty impressive. The Beastie Boys' "Paul's Boutique" is a psychedelic rap classic (not a lot of competition there). If you think you'd like an odd Beatle-ish/Rundgren/Neil Young influenced band (with a singer that doesn't sound like any of them), you might want to check out The Loud Family "Plants and Birds and Rocks and Things", "Interbabe Concern", "Days For Days", or "Attractive Nuissance".

That's all I can think of for now. Some of them are good recordings, but the true eccentrics don't often get handed a big budget.

'The dropper' by martin medeski and wood, will freak you out for sure. And it has that strange addictive element to it, that would make it worthwhile.