I've seen customers get asked to leave for playing chopsticks and heart and soul on the keyboards but those customers probably had no intention of making a purchase at that point in time. Music stores are often mistaken for music playgrounds and it can interfere with sales.
Continuo Playing According to Handel: His Figured Bass Exercises (Oxford Early Music Series)
According to ttw that’s all what I’ve found:
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This book is an edition, with commentary, of Handel'...
Handel did have students. He wrote some exercises in counterpoint for them. Apparently little is known about his students. There is a (behind a paywall) article: "Handel's students, two lovers and a shipwreck," by David Hunter. It's an intriguing title, perhaps for a movie like "Titanic." The only student I have actually read about was Princess Anne. Some ...