I heard this song today. I forgot how much I enjoy John's voice. His music is very relaxing, even though I never really got into his music. Katy and him together make a nice couple, which has honestly surprised me considering his past, but I've grown to like him. The song is very peaceful and nice. Katy's voice definitely mingles well with him, and it would be awesome if they did a duet on 'Prism'.