"I recorded Jimmy Page and Leona Lewis performing Whole Lotta Love by Led Zeppelin together... For me there were several moments that still seem a little unreal [like] realising just how technically and musically accomplished Leona Lewis is as an artist. I've not worked with many singers in the pop world who can discuss coloratura technique, and operas by Purcell and Bellini. [...] Leona can really sing with heart and soul, balanced with quite astounding technique."