Music Not

When playing a wind instrument (i.e Trumpet, Clarinet), one may come across a musical note (usually on sheet music) so much higher/lower than the rest, that the first reaction is typically a simple, "Hell no." Also applies to vocal music.

Trumpet 1: "Do you see that note dude?! It's so high!"
Trumpet 2: "No, that's not a music note, that's a music not."

Tenor 1: "How is any guy supposed to reach that?"
Tenor 2: "They aren't, that's a music not."