Opera singer Peter Brathwaite shares his passion for five very different singers whose voices, artistry and lives inspire and move him, and whose stories he needs to tell.

If you've listened to much pop music this century, you've almost certainly heard the voice of Alabama folk singer Vera Hall - though you might not know it. Brilliantly sampled by Moby in his single Natural Blues, Hall's extraordinary voice was recorded several times by renowned American ethnomusicologist Alan Lomax in the 1930s. To conclude his series, Peter explores what it is that makes this pretty much unknown woman's voice so particularly powerful, and reflects on why the singing human voice has the capacity to transcend time, space and situation and speak to us so deeply.