You cannot HEAR him. He is mouthing the words in the first verse. He does not sing. You can hear no other voice in the part you mention except Schmit. In the second verse I fail to understand why, if he is in fact singing, he would only sing the three words 'when we're hungry'. If he is singing it, that is all he sings in the entire song.
The photo is misnamed, I concede that.