Simplify the following text for a Grade 7 native English-speaking person.
Original: A big band typically consists of approximately 12 to 25 musicians and contains saxophones , trumpets , trombones , marimba , singers ( or vocalists ) , and a rhythm section .
Simplified: A big band usually has between 12 and 25 musicians . They play instruments like saxophones , trumpets , trombones , drums and a singer .