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When did The Tonight Show Starring Johnny Carson move to Burbank?
On May 1, 1972, the show moved from 30 Rockefeller Plaza to Burbank, California.
Why did The Tonight Show Starring Johnny Carson move to Burbank?
The show moved from 30 Rockefeller Plaza to Burbank, California, because of the studio's proximity to celebrities.

Question: What happened after this move?
Self-contained rewrite: What happened after The Tonight Show Starring Johnny Carson's move to Burbank?