 A combo organ is an electronic portable organ, usually transistorized (although some older designs used tubes; and later models, integrated circuits), that was designed for use on stage, usually in the context of a band or group.A combo organ is usually supported on a removable or folding stand or legs; these originally would have been supplied as part of the instrument.Combo organs were best known for their bright, reedy sound; their portability; surprising versatility; and relatively low cost.