BERLIN (Reuters) - Sting said contemporary rock music is so stagnant that he prefers to sing 16th century English ballads. The former teacher who shot to fame as lead singer, bassist and composer in the 1970s and 80s for The Police told German newspaper Die Zeit that he prefers singing songs of Elizabethan lutenist and composer John Dowland to the rock music of today. His album of Dowland lute music "Songs from the Labyrinth" has topped classical charts on both sides of the Atlantic and entered the UK album chart at No. 24. "Rock music has come to a standstill...