Vehicles may not contain sound systems which allow someone to hear noise outside the vehicle.

Section 9.07.010 Raucous Noise. No driver of a vehicle shall operate or permit operation of any radio system intended to make sound audible outside the vehicle when the vehicle is being operated upon a highway, unless such system is being operated to request assistance or warn of a hazardous situation. This section shall not apply…

It is illegal to skateboard and roller-skate through the courthouse and library.

17.20.010 Skateboarding and roller skating prohibited. No person shall use or operate any skateboard or roller skates on county property at the following locations, except in areas designated for such purposes by the director of the county department having jurisdiction thereof: A. The Los Angeles County Superior Court at 200 West Compton Boulevard, Compton, California;…

Drinking intoxicating cement is prohibited.

9.04.050 Inhaling or Drinking Certain Substances. No person shall inhale, breathe, or drink any intoxicating glue, adhesive, cement, mucilage, dope or any other similar material for the purpose of becoming intoxicated, elated, dazed, paralyzed, irrational, or for the purpose of changing, distorting or disturbing the eyesight, thinking process, balance or coordination of such person. Any…

It is illegal for a trumpet player to play his instrument with the intention of luring someone to a store.

9.04.020 Musical Instruments — Use in Attracting Customers for Sales. It is declared to be a nuisance and it is unlawful for any person vending, advertising or soliciting the sale of, or assisting in vending, advertising or soliciting the sale of any kind of notions, merchandise or medicines in the City to use a musical…