Solo album trivia question

Well, I've made it to the new forum, with a new & improved user name. I will miss the old forum. Anyway, to start things out here:

I recently made an observation that I'd like to turn into a trivia question.

There's a track that's on one G-man's solo album, but it is actually performed entirely by another G-man. What is the track?

Yes, that's correct.

onetwothree. I was never crazy about that name and I don't remember why I settled on it.

That's the one! I was listening to SMALLCREEP'S DAY and realized that track featured only keyboards.

Whether the "Smallcreep's Day" suite counts as a song or several songs, "After Hours" is a track on the album.