Regional pronunciation of “calliope”?

According to the section labelled "pronunciation" on Wikipedia, the musical instrument is pronounced /ˈkæli.oʊp/ and the Greek Muse is /kəˈlaɪ.əpiː/.

Oxford disagrees, listing only the latter pronunciation (or something approximating it). Merriam Webster lists both pronunciations for the musical instrument.

I would have said (cal-ee-ope) was the correct pronunciation in English. The Greek goddess would be (call-I-oh-pee) but the pronunciation of the original root isn't a good guide to how to pronounce it in English.

According to Steam Boats, this rhyme is supposed to help, but I don't see how - since you can rhyme it with either me or hope!

Proud folk stare after me,
Call me Calliope;
Tooting joy, tooting hope,
I am the calliope.

I invite your attention to the two pronunciations listed at Merriam-Webster. Unfortunately, I cannot clarify the usual pronunciation of this word in the southeastern U.S., as I did not hear it spoken in 11 years in that region (TN, SC and NC), to my recollection. Nor do I recall having heard this word spoken on the west coast (20 years) or the midwest (10 years) of the United States. I do not think this is a "usual word" in the southestern U.S.! I suspect among music scholars/enthusiasts it is not rare. Is it common in your corner of the english speaking world or do you have more knowledge of musical instruments than others in your region?
I'm sure I've seen the word before, and mentally I pronounce it like the people on your program, but I have never spoken nor heard this word. In looking up the word, I am surprised to learn it is of Greek origin, it looks Italian or Spanish to me. Perhaps it is lack of familiarity with the word that results in the pronunciation listed second in the reference I included...it is also quite possible that I misinterpreted the second phonetic transliteration to be what you describe. We are all the product of our experience, or lack thereof. I see nothing correct or incorrect about that.

This is not a regional pronunciation issue, rather it is a professional one. Those who played the steam whistle organ patented by Joshua Stoddard in 1855 - and those who worked in proximity to it, generally referred/refer to it as cal-ee-op (long o). Whether this originated in a mispronunciation of the Greek muse's name or not, it has become the standard pronunciation among circus, carnival and steamboat workers/enthusiasts.