Hailing from Geel, Jef Mertens has been researching, documenting and subtly exploring the experimental music scene in Belgium and beyond for the better part of two decades. As a filmmaker, he's dug deep in the realm of Flemish primitive fringe (Dronevolk) and chronicled the makings of giants like Sonic Youth and Borbetomagus. After running the now-defunct free tape label Dadaist Tapes, Mertens comes with 'No Mathematics', the first record collaboration between KRAAK and Feeding Tube.