Interesting example I remembered of uses of experiments with the voice in music, Simon and Garfunkel included the ‘song’ Voices of Old People on their album Bookends. This is a form of sound collage made up of tape recordings by Garfunkel at the United Home for Aged Hebrews and the California Home for the Aged at Reseda. The song effectively old people sharing memories, but features a departure from any form of music we would expect and provides an air of sentimentality that wouldn’t have been as effectively communicated any other way.