Group of nine players

• Nine singers singing
• Sextet plus a trio
• Group on Miles Davis's "Birth of the Cool," e.g.
• Small number in 10 upset group of players
• Nine-person musical group
• Trio, squared
• Good-sized combo
• Chamber group, maybe

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Nonet \No*net"\, Nonetto \No*net"to\, n. [From L. nonus ninth, like E. duet, fr. L. duo.] (Mus.) A composition for nine instruments, rarely for nine voices.

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 ).