Our business is to make things. Let other people judge. There are days when you're not writing a Mozart requiem. But there is no abstract hierarchy with Mozart at the top, and the Supremes at the bottom, with Cosi fan Tutti at one end, and the Ring Cycle at the other. A jingle can be as truthful as a requiem. . .
Hierarchies are antithetical to the business of making art.
Barker took some time to discuss the relative quality of 'success' for a creative person, depending on one's goal. Taste, Talent, Tenacity. You need a minimum of two of these to make it.