Any starting MLB team

• Big combo
• Quintet plus quartet
• Large chamber group
• Set of nine voices
• Tic-tac-toe squares, e.g
• Musical work for a set number of performers
• Group of nine, as in music
• Trio x 3
• Mid-sized jazz combo

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