Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Sebastian plays drums for percussion in an orchestra. He sits next to the brass section where four people play trombone, two play trumpet, and one plays a French horn. In front of them are the strings section with three violinists, a cellist, and a contrabassist. Next to the strings are a trio of clarinets and a quartet of flute players in the woodwinds section. The maestro conducts them all. How many people are in the orchestra?

### Response:
 Sebastian katika sehemu ya ala za muziki anafanya mtu mmoja.
Sehemu ya vyombo vya shaba ina watu 4 + 2 + 1 = <<4+2+1=7>>7.
Sehemu ya ala za nyuzi ina watu 3 + 1 + 1 = <<3+1+1=5>>5.
Sehemu ya ala za upepo ina watu 3 + 4 = <<3+4=7>>7.
Maestro ni mtu mmoja.
Hivyo, kikundi cha muziki kina watu 1 + 7 + 5 + 7 + 1 = <<1+7+5+7+1=21>>21.