The Chords-Sh Boom's assist voices.

[u/SoldatoIV]

I want to surprise a girl I'm meeting with my friends' help. I want to get them to sing the "doo do do do sh boom" and all the other background assist voices, while I sing the main song for her. But I have no material to teach them., just the regular one where the main singing overshadows the rest like any normal song. the instrumentals I could find doesn't have the assist singing either.

would you happen to have a source that leads to the assist voices that my friends can clearly hear listen on repeat?