National Trust engages a certain ensemble

• Supreme Court justices, at full strength
• Fairly large-sized musical group
• Small number in 10 upset group of players
• Expensive wedding band, maybe
• Music for a baseball team?
• Chamber players for Schubert's "Eine Kleine Trauermusik," e.g
• Wallenda request
• The Muses, for example

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 ).

Wiktionary Word definitions in Wiktionary
n. 1 (context music English) a composition written for nine instruments or nine voices 2 a group of nine nuclear or subatomic particles 3 (context computing English) A byte of nine bits.