Christoph Prégardien's selection of Des Knaben Wunderhorn songs, 10 of the 20-odd settings of the collection of folk poetry that Mahler made in the 1880s and 90s, contrast perfectly with Wolfgang Rihm's Rilke cycle, which the tenor introduced for voice and piano in 2002, and sang for the first time in their orchestral form two years later. The guileless world of Mahler's songs, with their bittersweet sentimentality and jaunty melodies, is far removed from Rilke's intensely wrought verse (taken from a posthumously published volume) and the chromatically drenched expressionism of Rihm's settings of it, which sometimes recall Schoenberg's early orchestral songs. Prégardien sings both composers with meticulous attention. He's wonderful at characterising the Mahler songs without ever making them twee; the shape of each phrase and the colours in it are there for a reason.