Possible Clues:

• Figure (on the 24?) which doesn't strike a chord at once
• Chord reproduced in opera gig
• Marion's content outside training horse said to make rhythmical jumps?
• Banjo sequence
• Opera gig (anagram)
• Hammer out opera gig with a flurry on the keyboard?
• Chord spread
• Notes quickly played at new opera gig
• Hammer out opera gig for one of those of note in succession
• Chord