Collocations for orchestra - noun

large, small
full
The full orchestra includes two harps.

great, major (esp. AmE), top (esp. BrE)
live
amateur, professional
symphony
chamber, jazz, string
school, youth

conduct
lead
join

perform (sth), play (sth)
strike up (sth)
The orchestra struck up a lively march.

tune up

pit

in a/the orchestra
She plays viola in a string orchestra.

orchestra under
the Ulster Orchestra under Philip Ledger

the leader of the orchestra (BrE) (concertmaster in AmE)