The Albany Symphony Orchestra and the region’s premiere vocal ensemble, Albany Pro Musica, have been collaborators for quite a long time. This weekend, they will perform a pair of concerts at the Troy Savings Bank Music Hall on Saturday night and Sunday afternoon, tackling a pair of choral works — Bach’s “Magnificat” alongside contemporary composer John Corigliano’s “Fern Hill” — on a program that also includes Haydn’s Symphony No. 48, known as the “Maria Theresa” Symphony. David Alan Miller – maestro of the Albany Symphony Orchestra and David Griggs Janower, director of Albany Pro Musica join us.