Why does the sousaphone belong to the brass family?

Answer 1

Because it's made of brass...... Hence it's a member of the BRASS family.

Answer 2

Because the horn is made of brass, and the mechanics and physics of playing it are similar to other brass instruments.

Answer 3

Because it is related to the Trumpet and Trombone.

This is because it is made of metal and therefore produces a brassy quality of sound.

Answer 4

Because it is made of the same material as the other brass instruments and uses the same process to achieve notes (i.e. it uses valves and buzzing through a mouth piece.)