Effective and fun for both middle school and high school chorus. (Also, upper elementary chorus)
Sheet music also includes SOLFEGE
Chorus students love this warm-up. It makes them think, is lots of fun, and great for diction as well.
This file is the sheet music for well-known number warm-up has been passed on anonymously for years. I created an .mp3 sound companion file which you can fine in the .mp3 category in my store.
There is a regular version and a faster version.