Related Clues:

• Record, say, dance number in front of gallery
• Century having come about, took down score
• Add runs to score, possibly, playing at Eton
• Write in symbols
• At Eton (anag.)
• Back working with gallery to write music
• It isn't the goddess who'll write the music
• Record in bars? A disappointment for art lovers maybe
• No gallery to provide written description
• No rubbish with English being put on paper
• Express in symbols message that would disappoint London's art lovers?
• Convert into sheet music
• Write down some music? Not a note!
• Make marginal markings
• Symbolically record a time in public school 'retrogressive'