He could not read or write, but he was wise, And knew right smart how to extemporize.
Being a victim of the unforeseen, no choice remains to me; I must extemporize.
They could extemporize board and men, but how to raise the bits of ivory?
I used to learn the songs by heart and invent and extemporize tunes for them.
If you extemporize you can get much closer to your audience.