I find that Butterworth thing annoyingly sentimental. Take a large dose of Grainger as an antidote.

Two more at the tough end of things: Luciano Berio's "Folk Songs" for voice and chamber orchestra (which goes all the way from "I wondered as I wandered" to a cracking Azerbaijani dance song he got off a 78) and Douglas Lilburn's tape piece "Poem in Time of War" (1967), which takes a woman's voice singing a Vetnamese folk song and progressively buries it under a wall of bomber-like electronic noise.