Dan Warburton, Paris Transatlantic Magazine

(…) Frequency of Use is a superb (…) set of duos between London-based guitarist John Russell and the young German alto and soprano saxophonist Stefan Keune. Recorded in London by Emanem’s Martin Davidson, two of the tracks live at the Red Rose, it’s a passionate and cogently argued set. Though largely self-taught, it’s clear who Keune has been listening to (these days, however, the work of the post-Evan Parker generation is often fresher and riskier than the prolific output of the master himself). Russell’s music is, as ever, a joy: you get the impression he’s just as agreeably surprised by what he’s doing are we are listening to it.