Decuplet or decimole
The answer is decades.
"ten" can be short for "tenuto", a direction in music which generally means to hold the designated notes for their full length or slightly longer if rubato is used.
A dectet (or a band or an orchestra)
It was the practice of many years ago, that if a note or group of notes were printed with flaws, that the notes would be destroyed and a new note or group of notes would be reprinted with a star on the end of the serial number, hence the term "Star note".
xscape-6 top ten hits in the 90's
Ten Notes on a Summer's Day was created in 1985.
The talk talk music group was formed in 1981 it ran for ten years ending in 1991.
20,20,20,20,20,5,5,2,2,1
tears for fears tavares talking heads 10cc ten years after
decate
If you had 15,000 Pounds worth of Ten Pound notes, there would be 1,500 Ten Pound notes. 15,000 divided by 10 = 1,500.
10,000,00,00,000/1000 = 100,000,000 notes