Every person, firm or corporation holding, promoting or giving a concerts, shall pay a license fee for each day of such performance depending upon the seating capacity of the place, as follows:
Places with a seating capacity of less than 500, $5;
Places with a seating capacity of 500 or over, $10.
A "concert" within the meaning of this Section shall be an entertainment open to the public at large, the principal part of which shall be composed of vocal or instrumental music or both, and to which an admission fee is charged.