National Trust engages a certain ensemble

• Quintet plus quartet
• Large combo
• Zero safety precautions, tight¬rope-wise
• Expensive wedding band, maybe
• Triple trio
• Supreme Court justices, collectively
• Ravel's "Trois Poèmes de Stéphane Mallarmé," e.g
• The Muses, e.g

Wikipedia Word definitions in Wikipedia
Franz Lachners Nonet in F major is a composition for chamber ensamble published in 1875.