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Extraneous means that something is irrelevant or something that has nothing to do with a particular subject. I hope this helps! :)
An ode typically addresses something to be praised or glorified.
As a result, an ode can address anything beautiful or great: a person, place, event, or even a thing (as in Ode On A Grecian Urn). Basically, an ode addresses anything the poet considers worthy of praise.