No help on the street piano's sign, I found this for the city ordinances:
Sec. 9-116. Noise disturbances Noise disturbances prohibited. The following acts are declared to be loud, disturbing and unnecessary noises in violation of this section, but said enumeration shall not be deemed to be exclusive. . . . (13) Radios, television sets, musical instruments, and similar devices. Operating, playing or permitting the operation or playing of any radio, television, phonograph, drum, musical instrument, sound amplifier, or similar device which produces, reproduces, or amplifies sound between the hours of 11:00 p.m. and 7:00 a.m. in such a manner as to create a noise disturbance.
no subject
Sec. 9-116. Noise disturbances
Noise disturbances prohibited. The following acts are declared to be loud, disturbing and unnecessary noises in violation of this section, but said enumeration shall not be deemed to be exclusive.
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(13) Radios, television sets, musical instruments, and similar devices. Operating, playing or permitting the operation or playing of any radio, television, phonograph, drum, musical instrument, sound amplifier, or similar device which produces, reproduces, or amplifies sound between the hours of 11:00 p.m. and 7:00 a.m. in such a manner as to create a noise disturbance.