1) Extemporisation 
• (n.) The act of extemporizing; the act of doing anything extempore.
Ex·tem`po·ri·za'tion noun The act of extemporizing; the act of doing anything extempore. 
[n] - a performance given extempore without planning or preparation
extemporization The action of speaking, or of composing and executing music, extempore; improvisation; an extempore performance.extemporize, extemporization, extemporizer 1. To perform or speak without having made any preparation. 2. To compose or perform a piece of music by improvising. 3. To do or devise something in a makeshift fashion.
extemporisation noun a performance given extempore without planning or preparation