A lot of eyebrows were raised in the orchestra world when Christoph Eschenbach, an enthusiastic promoter of new music, was hired to be the music director in Philadelphia, a city known for its ultra-traditional musical tastes. A look at the orchestra’s just-released 2005-06 season calendar indicates that some compromise between the two philosophies may be in the offing: the Philadelphians will focus heavily on Beethoven next year, but there will be several world premieres hidden amongst the warhorses.