 Complete the following phrase:  Phaethon is a symphonic poem by the American composer Christopher Rouse. The work was commissioned in celebration of the United States Bicentennial by the Philadelphia Orchestra with contributions from Johnson  Higgins. It was completed on February 22, 1986 and was given its world premiere at the Academy of Music in Philadelphia by the Philadelphia Orchestra under the direction of Riccardo Muti on January 8, 1987. It is dedicated in memory of the crew of the Space Shuttle Challenger, which 