Return to Forever - Romantic Warrior (1976)

Chick Corea's Return to Forever project is one of the benchmarks of mid-70s Jazz Fusion, what it lacks in songwriting it more than makes up for in technical prowess- Al DiMeola's guitar runs sizzle, Stanley's Clarke's bass lines pop and Lenny White anchors it all with some funky drumming. 

Chick is Chick, what more can be said about the man? If you find this too dense and impenetrable, try Chick's earlier stuff and work your way up to it. 

This comes with a disclaimer: they veer heavily into psuedoclassical territory here and if you're a fan of both jazz and prog as well as later-day jam band noodling (a la Phish, et. al.) then this one does not disappoint. 
Return to Forever - Romantic Warrior (1976; Columbia Records)

Frank Zappa - Philly '76 (2009)

Never underestimate Frank's ability to squeeze the maximum amount of talent out of his musicians- this album, recorded in a transitional period off the heels of the Zoot Allures album stands as a testament to his workmanship and passion for his craft. 

Bringing in Bianca Odin for vocals and keyboards and a stripped down backing band (Ray White on guitar, Eddie Jobson on violin and keys, Patrick O'Hearn on bass and Terry Bozzio on drums) it's an interesting filler and most likely only truly appreciated by hardcore Zappa fans. 
Frank Zappa - Philly '76 (2009; Vaulternative Records)

Guru Guru - Dance of the Flames (1974)

A guitar-driven Krautrock record from the Mani Neumeier-led Guru Guru; which is notable because Neumeier was one of the better drummers in the Kosmiche scene so for him to sort of step back and allow his supporting cast to shine here makes this record altogether more special.

This was the only record guitarist Houschäng Nejadapour recorded with the band, and his contributions are pretty spectacular- his playing borders on spine-tingling fusion jazz a la John McLaughlin's Mahavishnu Orchestra before giving way to straight up Krauty motorik and world music excursions.

Prepare to have your faces melted. Off.

Guru Guru - Dance of the Flames (1974; Atlantic Records)
-links to YouTube-

Frank Zappa and Captain Beefheart - Bongo Fury (1975)

This is beyond "required listening". Two legends; one at the apex of his career, one at the nadir. Zappa was selling out arenas and Beefheart couldn't get anyone to play with him (the entire Magic Band up and quit on him in '74, due to his "abusive behavior"). Needless to say, Beefheart couldn't get a gig at a dive bar and Frank felt he owed him (they've been friends since high school). The two geniuses had a pretty strained relationship around this time; they were both on "ego trips" says former Zappa drummer Jimmy Carl Black, with Beef mostly drawing sketches on-stage of Zappa and Frank in turn hating the Captain's work ethic (Zappa was a notorious workhorse).

This album is notable also for the lineup featured; it's at the intersection of two of Frank's greatest bands- blending the early 70's incarnation with Napoleon Murphy Brock and Chester Thompson with the late 70's era band with Terry Bozzio and the Fowler brothers.   

One of my favorite records of the mid-1970s; listen to the Captain ramble nonsense over fantastic Zappa art rock compositions. Enjoy!

Frank Zappa and Captain Beefheart - Bongo Fury (1975; DiscReet Records)

Dzyan - Electric Silence (1975)

Indian-influenced Krautrock that's heavy on both the free and fusion sides of jazz as well as heavier progressive rock; incorporating ambient passages a la Tangerine Dream throughout. These guys crafted a seriously "out there" vibe, it's one of the great lost Teutonic jazz rock albums; a true landmark in the Kosmiche genre that seems to get over-looked again and again, but I feel this record can go up against Can's Tago Mago, Faust's Faust IV, Neu!'s self-titled or Amon Düül II's Yeti. 

Check this out if you like getting super freaky...

Dzyan - Electric Silence (1975; Bacillus Records)