 Complete the following phrase:  From April 30 to May 2, 1991, Emmylou Harris and the Nash Ramblers performed three acoustic concerts at the dilapidated building, during which no one was allowed to sit on or beneath the balcony due to safety concerns. Capacity was limited to around 200. Some of the recordings were released as an album entitled At the Ryman, which won the Grammy Award for Best Country Performance by a Duo or Group at the 