Our Lemonade in the Lobby series will host Three B’s on the Prairie; Music of Bach, Beethoven and Brahms, part of the Boston- based Road Scholar program. Singers from across the United States and Canada are in Springfield to spend a week learning music to perform Thursday's concert. The workshop, Singing in the Heart of America, culminates in a 7 pm concert on July 13 in the Sanctuary. The event is free and open to the public. A dessert reception will follow the concert.