In the course of our conversation, a friend of mine used a term I thought I understood. Later, I discovered that I did not really know what it means.
The word was toccata. And this is what it means:
Toccata (from Italian toccare, "to touch") is a virtuoso piece of music typically for a keyboard or plucked string instrument featuring fast-moving, lightly fingered or otherwise virtuosic passages or sections, with or without imitative or fugal interludes, generally emphasizing the dexterity of the performer's fingers. Less frequently, the name is applied to works for multiple instruments (the opening of Claudio Monteverdi's opera Orfeo being a notable example).