You need to consult a local lawyer. Your state may have stalking laws or the like which can give you the basis for a cease and desist order, but generally speaking such an order against speech is considered a prior restraint and the courts will generally not issue a prior restraint on speech. You probably need to come withiin a statutory exception to get such an otder. Your lawyer can contact Facebook and following their procedures may be able to get the band's posting taken down.
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