Armenian National Academic Theatre of Opera and Ballet after Alexander Spendiaryan (Armenian: (Aleksandr Spendiaryani anvan ōperayi yev baleti azgayin akademiakan t'atron)) in Yerevan was officially opened on 20 January 1933, with Alexander Spendiaryan's Almast opera performance. The opera building was designed by the Armenian architect Alexander Tamanian. It consists of two concert halls: the Aram Khatchaturian concert hall with 1,400 seats and the Alexander Spendiaryan Opera and Ballet National Theatre with 1,200 seats