Cadenzas, where the soloist was expected to extemporize

At our moral best, we skillfully extemporize in response to each other with the aim of harmonizing interests.

Many hadith (traditional stories about the Prophet's sayings and actions) establish the spirit in which one is to vocalize the Qur'an's verses; other traditions not only set down technical rules for pronunciation and rhythm but also indicate where and how far one may extemporize, especially in the changing of pitch and the free shaping of lengthened vowels.