A '''tuba''' is a large brass wind instrument, the lowest in pitch of all commonly employed wind instruments. It is played vertically and has 3 to 5 values.<ref>The New American Desk Encyclopedia, Penguin Group, 1989</ref> | A '''tuba''' is a large brass wind instrument, the lowest in pitch of all commonly employed wind instruments. It is played vertically and has 3 to 5 values.<ref>The New American Desk Encyclopedia, Penguin Group, 1989</ref> |