Speaking of muses

. .

There were nine Greek muses. At one time they were goddesses of inspiring springs (such a perfect image), but then they became specialized.

• Calliope (holding a wax tablet), muse of epic song.
• Clio (with a scroll—shown above), muse of history.
• Euterpe (with a double flute), muse of lyric song.
• Melpomene (with a tragic mask and ivy wreath), muse of tragedy.
• Terpsichore (with a lyre), muse of dance.
• Erato (with a small lyre), muse of erotic poetry.
• Polyhymnia (veiled and pensive), muse of sacred song.
• Urania (holding a celestial globe), muse of astronomy.
• Thalia (with a comic mask, ivy wreath and shepherd's staff), muse of comedy and bucolic poetry.

(I'm rather surprised to see a muse of astronomy, frankly, in such ancient times.)

I've illustrated Clio, the muse of history, for obvious reasons -- but what does she actually inspire?