I think a robot could be programmed to make sound which would be perceived as music by those of the opinion that music requires emotion; in other words, I think a program could produce music and therefore emotion. Emotion doesn't necessarily need to be in the sound itself, but rather in the listener.
Furthermore, is "emotionless" an emotion?
And do we even care? This is a Radiohead thread, which while many don't like them, would generally be considered to be music.
Oh, and I almost forgot:
In my opinion :)