Supreme Court justices, collectively

• Sextet plus three
• Any starting MLB team
• Nine-man band, e.g
• Musical composition - tonne
• Group included in ban on Etonians
• Musical piece for nine
• Trio of trios
• Certain string ensemble
• Group on Miles Davis's "Birth of the Cool," e.g.

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