What does 'Brass band' mean?

[roman]

Test No. incompl/inter-47 "Speaking 4 (The Broadcast)", question 4

There is a long line of soldiers on horseback marching to the sound of a ......... band.

(a) copper
(b) brass
(c) zinc
(d) aluminium

Test No. incompl/inter-47 "Speaking 4 (The Broadcast)", answer 4

There is a long line of soldiers on horseback marching to the sound of a brass band.

Correct answer: (b) brass

Your answer was: incorrect
There is a long line of soldiers on horseback marching to the sound of a aluminium band.
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meaning of the brass band

[Torsten]

A brass band is a group of musicians who play wind instruments made of brass.

TOEFL listening lectures: To which entertainment does the lecturer not relate Greek drama?