Dutch electro-acoustic ensemble Thu20 is the co-operation between Roel Meelkop, Peter Duimelinks, Sjac van Bussel and Ios Smolders. Live in Groningen is an edited version of a performance they did during the Casa Electronica festival high up north in the Netherlands. The hearplay-like character of their set/ music is very much imaginative and holds a lot of reminding -- but not recognisable -- elements. It's almost as if a parallel world of sound is created, making the one it refers to as estranged as well. The sound of THU20 is a multi-layered whole, compiled of many smaller and bigger happenings, going through the complete range of audible sound and using it in many different ways. From highly digital to dusty acoustics, from very calm to disturbingly hectic. One moment all happens together, a spare moment later there is not much more left than a basic building block. It is exactly this tension and variation which keeps you tuned and fascinated. The way basic elements like repetition, tonal differences and time-elapse are used is truly original and surprising.