Parnassus
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Mount Parnassus in Greek mythology, sacred to Apollo and the Muses, symbolizing artistic and literary achievement. Frasier invokes Parnassus while trying to diplomatically cancel Jackson's show.
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Mentioned once in The Show Must Go Off.
The Show Must Go Off
Season 8 · Episode 12 · S08E12
“This brief rehearsal time that we've given you is far too short to reach Parnassus, home of the Muses.”