Sep 18, 2011 — 9:51:47 PM
By contract, musicians on Broadway do not have to show up to all performances, and this applies to the conductor as well. So yes, the associate conductor will "take over" when the main conductor is out, but they don't necessarily know in advance when they will be conducting. The assistant conductor is probably the assistant musical director, though I could be entirely wrong. It is likely that the percussion was piped in from another room, as percussion instruments typically take up a HUGE amo...