In an interview with Marcus Foster , he talked about Twilight song ( let me sign ) and Robert pattinson ..
'Let Me Sign' brought you to a lot of people's attention through the Twilight soundtrack. Were you happy with how Robert Pattinson performed it?
It’s really great. Originally that song was a bit of a joke, it was a clapping song that me and my friend wrote together and he turned it into this really serious, moody song. So it was quite funny. But it was great, we worked it out together and I really like it.
read the full interview here