Britain\'s Simon Rattle said Thursday that he would quit as chief conductor of the world-renowned Berlin Philharmonic Orchestra after his contract expires in 2018. The 57-year-old maestro said he will have been with the orchestra in the German capital for 16 years when he bows out, following 18 years in the same position in the central English city of Birmingham. \"As a Liverpool boy, it is impossible not to think of the Beatles’ question, \'Will you still need me.., when I’m 64?\' and I am sure that then it will be time for somebody else to take on the magnificent challenge that is the Berliner Philharmoniker,\" he said in a statement released by the orchestra. Rattle acknowledged that it was \"not an easy decision\" and said he looked forward to another five years at the helm in Berlin. \"I love this orchestra and therefore wanted to tell them my decision as early as possible,\" he said. \"I deeply hope that this will give them enough time to start new plans.\" It was not immediately clear who would replace him. Rattle has been quoted as describing his relationship with the orchestra\'s musicians as at times \"turbulent\" but he is extremely popular with Berlin\'s passionate music lovers and his concerts are routinely sold out. He arrived in Berlin from Birmingham in 2002 and succeeded the Italian Claudio Abbado.