“Builder's music becomes universal, whether it is for the divine, the spiritual or something completely different. It is a beautiful and overwhelming experience." 
♥♥♥♥♥♥ (6/6 hearts) - David Dyrholm, Politiken Newspaper

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“vibrant new energy...comparable to Éliane Radigue” - Boomkat’s Discoveries of 2025

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“My high expectations were quickly realised when I first listened to the album - from the first second I was transported to another world.
Strings and deep drums create an eerie introduction, while horns step in and out of the audible field, in and out of the shadows. Or is it really the listener moving around in the darkness? It certainly feels that way…” –Kristoffer Møllegaard, Passive/Aggressive

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“Denmark-based Aussie’s exploratory work for pipe organ is a winner…the effect is one of heavenly transcendence…a truly joyous experience. ” ★★★★½  (4.5/5 stars) – Lisa MacKinney, Limelight Magazine (AUS)

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"an engrossing duet...richly counter-melodic flurries and yearning themes...together they bring a degree of homemade technophilia to the performance that gains in intensity..."  - Kevin Le Gendre, Jazzwise(UK) on Kit Downes/Calum Builder Duo

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"Intensity, control, improvisation and looseness increase and decrease again during the course of the work, featuring chaotic strings, infernos of talk and song, strikes on the strings, uncontrolled winds, repetitive mass and chaos replaced by silencio, silence. The voices and the sounds in your head speak against each other, pulling you in all directions, gathering and taking new paths again...an excellent work for seekers..."
- Julie Hugsted, Seismograf

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“Builder brings about a symbiosis of overflowing beauty and rumbling disturbances.” - T.S Høeg, Jazz Special

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“an intense and dazzling triumph for Builder as a composer” – Kristoffer Møllegaard, Seismograf (DK)

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“There are so many images hidden in Murmuration: faded, esoteric and blurred as if photographed with trembling hands…ambient passages interrupted by mechanical rhythms and chaotic passages striking like a sudden storm” - Rasmus Weirup, Seismograf

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“Builder's solos burns with phosphorescent intensity...”- Fred Grand, Jazz Journal

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“In Builder you have a composer that is exciting to follow” -Jan Granlie, Salt Peanuts

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"Those who see, or rather hear, a totally unique musical excursion, are definitely onto something. Builder has created moods and tensions and conversations that are more than interesting to be invited into. Calum Builder has immediately told us that he is a unique and exciting voice."
- Tor Hammerø, Nettavisen

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“one of the brightest musical minds of the post-pandemic...” – Michele Saran, Eulogy (IT)

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"I can hear that this is a work that can go down in history as one of the great church works, and which can, and should, be performed in a number of church rooms around the world...Mighty, exciting and incredibly beautiful!" - Salt Peanuts

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“Enriched with the sounds of the saxophone, over time all phrases stick together, giving the impression that they arise from one immense voice.”
- Andrzej Nowak,  Spontaneousmusictribune

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“Builder possesses a sound of his own”  ★★★★  - Geoff Page, The Canberra Times

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“Builder is brimming with fresh ideas” - The Australian