of Extemporize
Source: Webster's dictionaryThe filmed interview is an art extemporized under difficult conditions and successful only when the interviewee hasn't prepared his replies beforehand. Damian Pettigrew
Armstrong's solos went well beyond the theme-improvisation concept, and extemporized on chords, rather than melodies. Source: Internet
The Legenda was intended to inspire extemporized homilies and sermons appropriate to the saint of the day. Source: Internet