The Swedish drummer and composer Sven-Ake Johansson has been deeply intertwined with the German free jazz scene since the mid-1960s, performing with the Globe Unity Orchestra and various groups led by saxophonist Peter Brotzmann. His roiling, turbulent style can be heard on dozens of classic titles. 

Schlingerland / Dynamische Schwingungen is his 1972 debut as a leader, originally released on the groundbreaking FMP label. Comprised of two side-long solo drum pieces, this is free improvisation of the highest order as tense, dramatic workouts lead into pulsating and meditative passages and then back again.