Sextet plus a trio

• Big band?
• Sign of confidence in acrobat group?
• Trio, squared
• Musical piece for nine
• Sizable music combo
• Small choir, maybe
• Small number in 10 upset group of players
• Artist bringing in name for mass performance piece
• Group: artist's a different leader

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"composition for nine instruments," 1865, from Italian nonetto , from nono "ninth," from Latin nonus (see nones ).