That's a sampled cello; it's like a keyboard. They've sampled real cellos but you're just hittin' keys. Me and Paul were sittin' in my house on the couch with two acoustic guitars and our drinks and he just played the riff. In the beginning he showed it to me at rehearsal and I didn't really like the way that it was kinda goin' in a certain way. So when we got home that night, I was like, OK, I'll make it better. I got the guitar and I just totally transformed it into a better song because it was a little bit kind of cheesy in the beginning. I changed it up real quick and Paul was like, OK, cool; great. So I gave him back the guitar and then I started making up all the melodies and I started writing all the lyrics and it came out very simple and it was done.