I read your threads, Bernhard, and you make a very convincing argument for listening to CDs of my pieces.
Should I do it, and just not tell my teacher? Or will he be able to tell that I'm listening?
Let us conisder this from another point of view altogether.
I don't know about you, but I derive intense pleasure from listening to music. Indeed such strong is this pleasure, that I want to be part of it. I want to play myself, I want to play with others and I want to teach others to play. I want my life to revolve around music.
What possible reason can there possibly be for someone to suggest that I should give up such pleasure?
Transfer this reasoning to haute cuisine. So if I want to be a chef I should never eat at anyone else's restaurant, watch any cooking program on TV, try any new dish prepared by someone else, just in case this stops me from developping my own culinary style? Even though eating well may be one of the greatest pleasures in my life, that brought me to cooking in the first place? I am only allowed to read recipe books and then from the recipes do the dish and then eat it? Do you really think (ask your teacher) this is the way to learn how to cook?
A few years ago, they had a comic program on TV "Chef" with Lenny Henry as a bad tempered foul tempered cooking genius. In one of the programs, his father, who was Jamaican and from whom he was estranged for many years, come to visit him at his posh French Restaurant. To cut the story short, Lenny decides to impress his father by cooking a Jamaican meal. He gets the books and follow the recipes, and soon he is completely frustrated. He tells his wife in frustration as they try a sample meal (she thinks it is tasty):
"The problem is, I have never eaten this stuff:
I don't know what it is supposed to taste like!"
And there you have it in a nutshell. The chef cannot start to change the recipes until he knows what it tastes like in the first place.
If I was a chef, you can bet I would be eaten in all restaurants in town at the very least to see what the competition is doing. And if it is good, you can also bet I would be imitating it and including in my menu!
In fact any profession I can think about that requires "interpretation" or "originality" (cooking, writing, acting, movie directing etc., etc.) studying the way other people - especially the genius - do it, is a required part of the syllabus. Anyone who has attended a writing course will have at some point as an assignment to imitate the style of a famous (or several) writer; in composition courses you are asked as an exercise to compose fugues in the style of Bach or sonatas in the style of Mozart.
Imitiation is a great learning tool. Being able to emulate the playing style of Gould, Richter or Tureck when playing Bach will teach you a lot about Bach, about Gould, Richter and Tureck and about the expressive capacities of the piano.
Go for it.

As for telling your teacher, it is up to you. If s/he is a tyrannical unapproachable person, why bother, do you really think anyone can find out from your playing to which CD you have been listening to? Now pull my other leg!

If s/he is nice and open to discussion then go ahead an make your case.
Best wishes,
Bernhard.