Either the percussion or strings, specifically cello section.
The percussion section often provides a repeating rhythm or ostinato that holds intact the rhythmic meter of a piece played by the orchestra.
The cello section will play important down beats and roots of harmonic chords that spread within the different part of the orchestra.
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You didn't put any answers, but I do know it is polite to greet the persons as they come on stage, and clap or cheer when they finish a song. It is also a good idea to put any electronic devices in sleep mode or simply turn them off.