S&M (short for "Symphony & Metallica") contains performances of Metallica songs with additional symphonic accompaniment, which was composed by Michael Kamen, who also conducted the orchestra during the concert. The idea to combine heavy metal with an epic classical approach, as James Hetfield has stated repeatedly, was an idea of Cliff Burton. Burton’s love of classical music, especially of Johann Sebastian Bach, can be traced back to many instrumental parts and melodic characteristics in Metallica’s songwriting including songs from "Ride the Lightning" and "Master of Puppets". The other inspiration was Apocalyptica's album Plays Metallica by Four Cellos, which included Metallica's songs played on four cellos and Deep Purple's 1969 Concerto for Group and Orchestra. Purple revived their hyb