"Passengers on the flight, which originated in Moscow and stopped in Sochi to refuel, included 64 members of the Alexandrov Ensemble, the Russian military choir, who were traveling to Russia's Khmeimim Air Base in Syria. The band planned to serenade..."
http://mobile.nytimes.com/2016/12/25/world/europe/russian-military-plane-crash-alexandrov-ensemble.html