The Bach Dancing and Dynamite Society will wrap up its 25th anniversary jubilee with a quartet of concerts this weekend at the Playhouse at Madison’s Overture Center and the Hillside Theater at Taliesin in Spring Green.  The “Quicksilver” program, running this Friday at Overture, and Sunday at Taliesin, features one of Bach’s Brandenburg Concertos, a Mozart Concerto and a Mendelssohn Octet.  The “Don’t Cry for Me Argentina” program, at the Overture Saturday and Taliesin Sunday, features works by Vernel, Vivaldi and Piazolla.  Director Samantha Crownover joined the Buzz’s Brian Standing in the studio.