It depends on what kind of band. If it's a rock band then i would be every instrument besides drums, bass guitars, guitars, keyboard, and sometimes violins. If it's a school band then it woudl be any...
The instruments that can be in a band and an orchestra include the flute, clarinet, bassoon, other woodwinds (no saxophones), trumpet, trombone, tuba, french horn, other brass (no euphoniums) and...
Most orchestra pieces will not have a cornet, flugelhorn, tenor horn, baritone, euphonium or b-flat bass part, but the occasional piece will call for one.