This pan-European collaboration, recorded live, has an almost traditional avantgarde feel to it, if that’s not a contradiction in terms. It follows a mould of loose, improvised and wilfully unpredictable experimental jazz and classical music that has existed for decades, and manages to be both classical and jazz in parts. Noetinger’s electronics bring additional modern digital surprises, but these are twists of lemon in an otherwise fairly familiar cup of tea.

After a spiky first five minutes, “Plastic Concrete” settles into suspended drones reminiscent of György Ligeti, with the cello and brass performances being pushed to their natural limits. The electronics return to the fore towards the end, with more use of what sounds like radio signals and everyday foley blended into something unrecognisable.

Recorded over a year apart, the Apartment House ensemble is a different line-up between the two pieces, with only the cellist in common. On the second and longer piece “Accumulation”, the brass and bass have gone, and the extra violins and a viola added give things a more familiar avantgarde-string-quartet-like sound. The super-slow glissandos and fluctuations and the wavering between chord and discord are hypnotic, treading a fine line between mesmeric and uncomfortable. The abrupt stabby staccatos make a brief return halfway through, before a staggered extended outro of arpeggios gradually descending in energy to an unexpectedly soporific close.

This is an unusual and enjoyable collection of two very cultured, semi-improvised pieces of music that’s “avant-garde” and “post-modern”, but in ways that resurface the old naive question, is it truly avant-garde if people have been doing this for decades?