Many of the well-known "money notes" written for the tenor voice are from the bel canto era, such as Donizetti's sequence of 9 "C"s above middle C during La fille du régiment.
The term "money note" refers to a challenging and virtuosic vocal passage for tenors, often found in operas from the bel canto era. Donizetti's famous sequence of nine "C"s sung high above middle C in his opera La fille du régiment is a prime example of this type of vocal writing.