As a composer, Lukas Foss (1922–2009) was fluent with a variety of different mediums, including works for orchestra, chamber ensembles, solo instruments and voices. He eagerly explored a wide variety of twentieth-century styles, including improvisation, electronic music, neoclassicism, twelve-tone techniques and minimalism. The latter style is especially evident in his work “…then the rocks on the mountain began to shout.” composed in 1977 for seven a cappella singers (2 sopranos, mezzo-soprano,...