Caspar Diethelm (1926-97) was one of the leading Swiss composers of the twentieth century. His free-tonal style - angular yet accessible - drew on the inheritance of several of his predecessors, above all Hindemith, Honegger (both of whom were his teachers), Martin and Schoeck, with Bartok adding rhythmic spice. These influences he combined with an awareness of modernism to form an individual and expressive musical language of his own. The three concertos recorded here are remarkable for the striking clarity of their orchestral textures; they also exhibit Diethelm's fondness for enlivening his narratives with surges of energy and touches of gleeful humour.