Well it is a very stupid question showing no knowledge at all of music, but I'll give it a go just in case the OP is not trolling.
A "quartet", a "quintet", etc are not musical terms, they simply refer to a number. So any group of 4 can be called a "quartet". A quartet of scientists. A quartet of singers. A quartet of musical instruments being played.
Music has been written by many different composers for a "string" quartet and the parts are commonly 2 violins, a viola, and a cello. However if one wanted to they could play that piece using any 4 instruments. For example a brass quartet or quintet will often play music originally written for strings. A piccolo trumpet is often used to play high flute or piccolo parts, as an example.
There are no rules, only customs. If a lover of classical music attended a concert of string quartet music and had to endure 4 double bass playing the 4 parts he/she would probably be disappointed, unless they knew ahead of time and wanted to hear those pieces played by those instruments.
Music written for a quartet can be played by any 4 musical instruments, with appropriate transpositions, but it won't necessarily sound pleasing.
..*.. TxMike ..*..
Take a risk, Take a chance, Make a change. Kelly Clarkson - Breakaway
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