What is the X Factor in Royalty Free Music X? Simply, the X Factor represents unique, creative music that puts a premium on quality and originality. RFMX explores the creative bounds of producing music that is unique -- no more mediocre, generic, canned music! Their genres include Rock, Metal, Pop, Country, Jazz, Acoustic, Urban, Electronica and more. RFMX's hot tracks have been featured in many high profile commercials and corporate websites.