extemporise

vt.

即兴创作，即席演奏；

1. He had to extemporize because he had forgotten to bring his notes.
   他因为忘了带讲稿，只好即席发言。

Back to the future: towards the revival of extemporisation in classical music performance
The Myth of the Golden Age
Let clinicians, of all disciplines, practice their profession and brace yourself for the deluge of applications.
The Organ Music of Sir Edward Elgar
Form and Structure of African Music: A Generative Theory of Structural Organization by Willie Anku
BeautyBag: Heaven Scent: Mimosa Is the Fragrance of the Moment
Music: Chilled out, Tuned in and Keyed Up ; His Music May Be Mellow, but Finley Quaye Admits He's Yet to Simmer Down. by Mike Patten...
Splitting Images: Communication in Classical Athens
Geoffrey Tozer
A study of the poems of George Turbervile