master class

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An advanced music class taught by an eminent musician.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A class, typically in a performing art such as music or drama, in which a teacher listens to and critiques the performance of individual students, one at a time, while the other students look on.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a class (especially in music) given to talented students by an expert