[The Saucepan Man]

Ah now, is this conclusive proof of the existence of learned magic in JRRT's world?

From The Hobbit, Out of the Frying-Pan into the Fire:

But, of course, Gandalf had made a special study of bewitchments with fire and lights (even the hobbit had never forgotten the magic fireworks at Old Took's midsummer-eve parties, as you remember).

So part of Gandalf's magic, at least, seems to have derived from study. No doubt, as a Maiar, he had the capacity for magic. But perhaps one aspect of the constraints put upon him and the other Istari when they came to ME was that they were unable to use their innate powers to the full. Maybe, therefore, Gandalf felt that he had to study to build up his powers on his arrival in ME, in order to prepare him for his mission.