Calliope is one of the nine Muses. She is the Muse of Epic Poetry. She is considered the most significant Muse because she "attends on worshipful princes." She is usually depicted wearing a gold crown and carrying a writing tablet, a scroll, or a book in her hand.
As it is a Hellenic (Greek) name, and also my name, the correct pronunciation of it is: Ka-llyi-oh-pyi. Some other linguists however relate it to beautiful eyes from the present perfect tense of the verb "see" (simple present: orao (type A), oro (type B), opopa (present perfect) and opthalmos which is the eye in Ancient Hellenic) and some others to beautiful face from "opsis".