G Clef Fusion – Diabolus Scis in Forma Musica – Album Review

G Clef Fusion’s fourth full-length album has arrived: Diabolus Scis in Forma Musica, which, when translated from the Latin, ominously turns out to be “The Devil You Know in Music.”

But diving into the record, it’s hardly the Satanic frenzy you’re expecting. Opening with the epically titled, and epically funky “B.L.T.”, G Clef proves jazz fusion is still alive and rocking through this upbeat, psychedelic jam, as creatively rich and wild as a progressive 60s/70s masterpiece. Thick basslines underscore a feral organ, played by G Clef himself, Chuck Moyer, with accompaniment from UK drummer Tom Warner.

Diabolus Scis in Forma Musica may be an instrumental album, but don’t let that deter you from soaking in G Clef Fusion’s rainbow of inspiration. Each of these eleven tracks harbours something wild, addictive and obscure, inviting you to plunge deep into the grooves like a dive-bomber and let the oddities of G Clef’s compositions float you away to distant and delirious realms of sound.

“Hidden in Zagre Forest” brings pixellated video game aesthetics to the forefront, weaving a tapestry of quirks through its bright and ever-evolving synth layers, spewing vibes somewhere between Bowser’s Castle and vintage sci-fi horror.

But, “Tripping Over A Tritone” lets this theme ascend to a brand new level. The Devil’s chord takes centre stage in this janky, spidery and chaotic piece of gothic horror, serving haunted house energy with a technicolour twist. Need a new soundtrack for your Halloween party? This is the ONE.

G Clef Fusion tells us that this album promises listeners the “musical exploration of the unseen,” of things which are not what they seem, and of those nameless things that go bump in the night. And he absolutely nails this vision, dusting each eccentric track with a vivid feeling of uncertainty; each song carving a new path through sound which leads us right to the cusp of musical reality, unknowing where on Earth we’ll end up next. It’s bold, unafraid and experimental, each piece peeling away from common song structure to unearth new and untapped moods, flavours and directions within the jazz-psychedelia genre. But in the midst of G Clef Fusion’s artistic chaos, anchoring themes emerge; the finished album being wonderfully solid, informed, and self-assured.

“Secret Decoder Ring” pulls things back into recognisable shape with its more straight-forward jazz vibes (straight-forward by G Clef Fusion’s standards, at least) – meandering through various cosy and classy restaurant atmospheres as if listening to an in-house pianist improvise new classics on the spot.

Closing track “After Party” ties the record up in style, lending the limelight to Moyer’s prog rock organ for a flamboyant, three and a half minute solo, as colourful as an overgrown rose garden tangled with oddball weeds and wildflowers.

Released December 4th 2025, Diabolus Scis in Forma Musica follows G Clef Fusion’s five-track EP, “With Dark and Light,” which dropped in June 2025.

So, what do we think of Diabolus Scis in Forma Musica? It’s perhaps the most lawless record we’ve listened to recently (in the best possible way), and we’d be surprised if its infectious grooves don’t take root within you as well.

Final verdict? Recommended.
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BELOW: Listen to G Clef Fusion and check out his music on major streaming platforms. Please support G Clef Fusion by visiting his website and playing, downloading, and/or purchasing his music. And, as always, thank you for supporting real music.