A trio.
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Typically a string quartet is two violins, one viola, one cello.
There are 15 possibilities. In psuedo-code, the math works out like this: n = 42-1 where n is the number of possibilities, 4 is the size of a quartette, 2 is the number of different types of singers, and -1 reflects that a quartet of all non-sopranos does not meet your criteria.
A group of four musicians or singers are called a quartet. A group of five musicians or singers are called a quintet.
There are many places where one can find information about the barbershop quartet. These places include, but are not limited to, Wikipedia and their official webpage.
A quartet. Typically would have one soprano (highest vocal range), one alto (second highest), one tenor (second lowest), and one bass (lowest).
It's called a Quartet. :D
Typically a string quartet is two violins, one viola, one cello.
1 minus 1/2 minus 1/3 is equal to 0.166667
mindless behavior which they is a quartet
Quartet or Foursome.