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In brief, a string quartet is accompanied with a piano. A string quintet has two violins, a viola and a cello.
Yes, it is a string quartet, and was written in g minor, and by Mozart.
Five, since a quartet is a form of four, and quintet a form of five. Sextet would be the form for a six instrument piece.
1 = Solo
2 = Duet
3 = Trio
4 = Quartet
5 = Quintet
6 = Sextet
nuno flores string quartet or corvonuno string quartet