Fan Casting All-Knowing Singing Narrator in Sort by Tropes

Y' see, I may be a narrator but I am also a talented vocalist, a singer if you will. Now, if you biddly-boppers pay heed to the Trope Title, then you oughta know that I’m aware of everything that's going to happen in the plot. And what better for me (though not necessarily all the time) to step in for a musical; what good is a musical if the guy tellin' the story ain't singin' along? Say, baby, if you gon' be lookin' for the singin' narrator ensemble, then go 'head and check out Greek Chorus. For a more general, how do ya put it, categorization of folks with an awareness of the work's fictionality, why don't you go on and take a look at Fourth-Wall Observer. Anyway, back to my mel-o-dee!