On Migration, Slava Grigoryan and the Australian String Quartet have teamed up to record three recent works written for the unusual combination of guitar and string quartet. The album is named for the first of these, a single-movement work composed in 2003 by American guitarist Ralph Towner, a name that will be more familiar to fans of the German jazz and new music record label ECM than to classical music audiences.

Migration languished unrecorded until now, and Towner credits Grigoryan’s enthusiasm and prodigious skill (indeed, in his hands its complex technical demands seem effortless) as central to the success of the work’s complex scalic runs and their integration with elegantly angular string parts.

It sits easily alongside Flexible Sky by Austrian guitarist and composer Wolfgang Muthspiel, a dynamic but contemplative work comprising four contrasting movements. Dark and exciting, it features beautiful glissandi, and the notable interplay between violins and guitar reflects Muthspiel’s earlier training on that instrument. Nevertheless, for Flexible Sky, Muthspiel’s approach to instrumentation is democratic, noting that for him the work is “an interactive web of equal voices”.

Towner, Muthspiel and Grigoryan regularly perform together as a guitar trio, indicating a degree of intimacy and mutual...