. . "AAuctioneers, hawkers, peddlers, taverns, dram shops, saloons, liquor sellers, billiard tables, bowling alleys, drays, hacks, omnibuses, and other vehicles used in the city for pay, shows, theaters, and all kinds of exhibitions for pay: Provided, That all kinds of scientific and literary lectures shall be exempt from such taxation, as well also, as concerts and other musical entertainments exclusi" . . .