The Muse of epic poetry in Greek mythology (8)

I believe the answer is:

calliope

(Other definitions for calliope that I've seen before include "Greek Muse of eloquence and epic poetry, or a kind of organ" , "something powered by steam" , "Steam organ: Muse of epic poetry" , "One of the Muses" , "One Muse" .)

I've seen this clue in The Independent.

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