Isabelle Faust plays Bartok like a wonder-struck explorer confronting new terrains. She wrestles triumphantly with the First Violin Sonata's knotty solo writing, reduces her tone to a whisper for the more mysterious passages, employs a wide range of tonal colours and trans forms the finale's opening bars into a fearless war dance. This is cerebral music with a heart of fire and will brook no interpretative compromises: you either take it on its own terms, or opt for something milder.