Several years ago, the 42-year-old Philadelphia musical institution known as Concerto Solists changed its name to the more formal Chamber Orchestra of Philadelphia, and ever since, the ensemble has been moving towards becoming a major professional ensemble. “Some of the 2006-07 repertoire, from Beethoven’s Symphony No. 1 to de Falla’s El Amor Brujo, could easily appear in Philadelphia Orchestra programs across the Kimmel Center plaza. In fact, the 2005-06 season opened with Beethoven’s Symphony No. 5, programmed the same week the Philadelphia Orchestra played it.”