What instruments are found in a big jazz band?

The classic "big band" swing group would have a choir each of trumpets, trombones and saxophones, with piano, drums, upright bass and guitar. Flute and Clarinet made occasional appearances, almost always by one of the other players who "doubled" on that instrument. Most big bands also had one or two featured singers,who sang on anything from a few to most of the bands numbers, depending on the band.