older references like "spitting", "on the spot" and "unscripted". Often times these terms are followed by "freestyle" e.g. Killer "Off top Freestyle" by (Artist X)! This type of rapping requires the artist to both spit their lyrics over undisclosed and possibly rotating beats, but additionally primarily completely improvise the session's rapped lyrics. Many "off top" rappers inadvertently reuse old lines, or even "cheat" by preparing segments or entire verses in advance. Therefore, "off the dome" freestyles with proven spontaneity are valued above generic, always usable, or rehearsed lines or "bars". Rappers will often reference places or objects in their immediate setting, or specific (usually demeaning) characteristics of opponents, to prove their authenticity and originality. Battle rapping, which can be freestyled, is the competition between two or more rappers in front of an audience. The tradition of insulting one's friends or acquaintances in rhyme goes back to the dozens, and was employed famously by Muhammad Ali in his boxing matches. The winner of a battle is decided by the crowd and/or preselected judges. According to Kool Moe Dee, a successful battle rap focuses on an opponent's weaknesses, rather than one's own strengths. Television shows such as MTV's DFX and BET's 106 and Park host weekly freestyle battles live on the air. Battle rapping gained widespread public recognition outside of the African-American community with rapper Eminem's movie 8 Mile''. The strongest battle rappers will generally perform their rap fully freestyled. This is the most effective form in a battle as the rapper can comment on the other person, whether it be what they look like, or how they talk, or what they wear. It also allows the rapper to reverse a line used to "diss" him or her if they are the second rapper to battle. This is known as a "flip". Jin The Emcee was considered "World Champion" battle rapper in the mid-2000s. Derivatives and influence Throughout hip hop's history, new musical styles and genres have developed that contain rapping. Entire genres, such as rap rock and its derivatives rapcore and rap metal (rock/metal/punk with rapped vocals), or hip house have resulted from the fusion of rap and other styles. Many popular music genres with a focus on percussion have contained rapping at some point; be it disco (DJ Hollywood), jazz (Gang Starr), new wave (Blondie), funk (Fatback Band), contemporary R&B (Mary J. Blige), reggaeton (Daddy Yankee), or even Japanese dance