To lay all these overweight rumors to rest, I checked my old notes (all figures metric tons, for TU5 B-2 model):
OEW ~51.5 tons (depending on cabin configuretion, number of crew, etc.)
MAX FUEL 37.6 tons (meaning all tanks full)
MTOW 98 tons
This means that with full fuel tanks the permissible maximum payload is ~10 tons, that is exactly what you would expect for 98 passengers and their baggage (an orchestra's instruments in their protective cases are bulky but not particularly heavy, the luggage would fill the holds to maximum volume leaving room for little else). The ATC communications confirms that the crew knew they were at/near MTOW.