• For a string quartet to branch beyond mainstream repertoire (not that we ever tire of Haydn, Schubert, Beethoven or the rest who count as “mainstream”) requires thought and daring. The Dudok Quartet Amsterdam have both. The group’s latest release, What Remains (Rubicon), takes its title from a two-part work by Joey Roukens (b.1982), written for them in 2020. The first movement is hard driven, full of whirring energy, the second meditative, with reflections on medieval or renaissance polyphony.