>Having Bill step in and do the usual "Oh my god he's so good at singing" thing kind of cheapened it.

Bill wasn't very good at singing. He just didn't miss the notes. He's just as awkward as Frank was, the point is that he's obviously practiced it over and over and even with the voice not being very good at all you can tell he means it.

The point isn't "oh god, he's good at singing" it's "oh god, something finally unlocked in this man."