(1) Notwithstanding the provisions of Article 14 and Article 15 of this Convention, income derived by public entertainers, such as theatre, motion picture, radio or television artistes, and musicians, and by athletes, from their personal activities as such may be taxed in the Contracting State in which those activities are exercised. However, income derived from such activities shall be exempt from tax in that State if the activities are performed under a cultural agreement or arrangement between the Contracting States.