An unceasingly brilliant contributor to, we believe, more ECM studio recordings than any other musician, Jon Christensen finally has an album released under his own name. Band-leading has seldom been the great Oslo drummer’s priority but in his selection of tracks for his :rarum disc, there is no mistaking the way in which Christensen has driven some mighty ensembles from his seat at the back. Titanic performances from Keith Jarrett’s “Belonging” group, Terje Rypdal’s “Waves” band, the Bobo Stenson Trio, Ralph Towner and more…