No matter how many people try, no matter how many fancy songwriters in Los Angeles try to break it down to a formula... to an extent, there isn't a science to writing great songs, I suppose. For me, it's always about melody - it doesn't matter what genre of music you're writing, if there's a strong melodic thing somewhere, whether that's in a vocal or in a guitar part or a sample. Something that sticks in your brain, that seems to be something that works.