Queen have been recognised as having made significant contributions to such genres as hard rock, and heavy metal, among others. Hence, the band have been cited as an influence by many other musicians. Moreover, like their music, the bands and artists that have claimed to be influenced by Queen and have expressed admiration for them are diverse, spanning different generations, countries, and genres, including heavy metal: Judas Priest, Iron Maiden, Metallica, Dream Theater, Trivium, Megadeth, Anthrax, Slipknot and Rage Against the Machine; hard rock: Guns N' Roses, Def Leppard, Van Halen, Mötley Crüe, Steve Vai, the Cult, the Darkness, Manic Street Preachers, Kid Rockand Foo Fighters; alternative rock: Nirvana, Radiohead, Trent Reznor, Muse, Franz Ferdinand, Red Hot Chili Peppers, Jane's Addiction, Faith No More, Melvins, the Flaming Lips, Yeah Yeah Yeahs and The Smashing Pumpkins; pop rock: Meat Loaf, The Killers, My Chemical Romance, Fall Out Boy and Panic! At the Disco; and pop: Michael Jackson, George Michael, Robbie Williams, Adele, Lady Gaga and Katy Perry.