Keyboard concertos by Johann Sebastian Bach left Weimar in 1717. Many of Bach's orchestral harpsichord concertos are adapted from a model with one or more violin solo parts. Several of these earlier models are extant. The oldest of these is Vivaldi's concerto for four violins, RV 580, published in 1711, model for Bach's concerto for four harpsichords, BWV 1065. Bach replaced the part of his fourth "Brandenburg Concerto", BWV 1049, composed in 1721 or earlier, by a harpsichord part when he reworked it to the harpsichord concerto BWV 1057. Bach's extant violin concertos BWV 1041–1043, two for a single violin soloist and one for two violin
Jack Brandenburg a member of the board of the Huron-Clinton Metro Parks Authority. Brandenburg and his wife Karen Linenger are the parents of four children. Brandenburg is a Roman Catholic. Jack Brandenburg Jack Brandenburg (born October 22, 1951) is a Republican Michigan state senator. He was elected to office in 2010. Previously he had served for six years as a member of the Michigan House of Representatives and a member of that body's appropriations committee. Brandenburg was born in Canton, Ohio. He has a bachelor's degree from Ashland University. Brandenburg is a businessman who founded and owns Blue Water Industrial Supply, a