An Act amending the act of July 29, 1953 (P. L. 1034, No. 270), entitled "An act creating as bodies corporate and politic "Public Auditorium Authorities" in counties of the second class and in cities of the second class, singly or jointly; prescribing the rights, powers and duties of such Authorities; authorizing such Authorities to acquire, construct, improve, maintain and operate public auditoriums; to borrow money and issue bonds therefor; providing for the payment of such bonds and prescribing the rights of the holders thereof; conferring the right of eminent domain on such Authorities; empowering such Authorities to enter into contracts, leases and licenses with and to accept grants from private sources, the Federal Government, State, political subdivisions of the State or any agency thereof; authorizing the making of said grants from bond funds or current revenues; authorizing Authorities to collect rentals, admissions, license fees for the use of the project; exempting the property and securities of such Public Auditorium Authorities from taxation," extending the provisions of this law to cities of the second class A and counties in which a city of the second class A is located; and making editorial changes.