The Philadelphia Orchestra is an American symphony orchestra, based in Philadelphia. One of the "Big Five" American orchestras, the orchestra is based at the Kimmel Center for the Performing Arts, where it performs its subscription concerts, numbering over 130 annually, at Marian Anderson Hall (formerly Verizon Hall). From its founding until 2001, the Philadelphia Orchestra gave its concerts at the Academy of Music. The orchestra continues to own the Academy, and returns there one week per year for the Academy of Music's annual gala concert and concerts for school children.
https://en.wikipedia.org/wiki/Philadelphia_Orchestra