In the Film 'Xanado' about a nightclub owner and an artist both lossing their touch.Staring Gene Kelly and Oliva Newton John, there were eight muses, listed in the credits plus Miss John makes Nine! See above link.
If you would like the names of the 9 muses as well,they are:- Muses of
1.Thalia Comedy
2.Clio History
3.Melpomene Tragedy
4.Urania Astronomy
5.Polyhymnia Song and mime
6.Erato Love poetry
7.Euterpe Lyric poetry
8.Calliope Epic poetry
9.Terpsichore Dance
Just thought you might be interested to know the names of the muses.