The Muses - the nine goddesses from Greek mythology
who are responsible for the inspiration of artistic work.
John Lennon & Yoko Ono inspired each other,
they were each other's muses
Jim Morrison said he was inspired by the spirit world
Joni Mitchell, folk rock artist, said her creativity came from her spirit guide.
Some believe their inspiration comes from God/the Universe and they are just a tool, that they are being used or are possessed.
Does a MUSE have to be a person -
real or spirit or imagined . . .