It is unlawful for any person, as operator, owner, manager or otherwise, to have in operation, or cause or permit to be in operation, any radio receiving set, piano or other musical instrument between the hours of ten p.m. of any day and ten a.m. of the following day or to permit or allow any loud or unusual noise or boisterous or disorderly conduct, at any time on such premises; provided, however, this section shall not apply to any such course erected, constructed or laid out within a building. (Prior code § 5.03.016)