It is the coördination of the finger and hand as examplified in the proportionate speed of shifting according to the speed of the musical passage, which makes for evenness, continuity, smoothness, and ultimately, a fine legato.

the enchanting cerebralisms of Eliot

Genfic and hetfic typically extend the source material along lines consistent with the producers' intentions, albeit sometimes more explicitly than the broadcast market would allow.

I thought for three hours about the problem and still couldn’t find the solution.