There are four well-known criticisms of the established canon of the pre-1960 period:

Feminists like Professors Gilbert and Gubar have raised equally provocative questions about the established literary canon.

Currently, we're going through a period of intense examination, questioning and revision of many established canons.

In other cases, stories clearly contradict established canon.

Besides being an artist who followed the established canons dictated by the Salon and the general public, he followed his own inner impulses of artistic creation.

Star Trek books are not considered part of the established canon.

It was intended to preserve the back story of King's Quest, and fit into the established canon.

Many of these works are now prominent in the established canon of choral music that is available for upper voices.

Without knowing how Mr. Kimball feels about newcomers entering the established canon, it is hard to tell exactly what he is defending.

In opera, more than in any other performing art, the loyalty of audiences for the established canon overwhelms an interest in contemporary contributions.