You might have come across poetry from back in the day that has lines that start "O Muse!" or "Ye Gods!" If a recently-written poem had an apostrophe to the muses or gods, you better hope it's ironic or messing around with the old style. Otherwise, that's pretty cheesy. John Keats' poem "Ode to a Grecian Urn" was written in the nineteenth century, and even he is giving the muse a hard time. Langston Hughes isn't being cheesy either, because his apostrophes are to blues music. And the blues is a muse you can get behind.