Possible Clues:

• Calliope and kin
• Those ungrammatical ways of employing all nine of them
• Are there nine sorts of inspiration from them?
• Thye're only nine, but there are a thousand ways of using them
• Manages to support those people who could inspire others?
• Those ungrammatical employments, nine in all
• Those ungrammatical employments of the nine of them
• 'It's them one employs, all nine of them (3,5)'
• Those ungrammatical employments of nine