Possible Clues:

• Bad news for Wimbledon players?
• Largish chamber group
• Group of musicians with nobody on trumpet at first
• Three-trio combo
• Before tea nobody is so musical as this
• Ravel's 'Trois Poèmes de Stéphane Mallarmé,' e.g.
• X on the turn of the music?
• Nobody comes to tea at last if there''s such music
• Largish musical group
• Books about a certain music group