The band's lyrics, as sung by Till Lindemann, are an essential element of their music, and shape the perception by fans and a wider public. Among other things that are seen as controversial, Rammstein also refers to classical German literature, e.g. Johann Wolfgang von Goethe's famous poems "Der Erlkönig" (1778) and "Das Heidenröslein" (1771) for the songs "Dalai Lama" and "Rosenrot", respectively. Several of their songs are related to controversial and taboo subjects such as sadomasochism, homosexuality, intersexuality, incest, pedophilia, necrophilia, cannibalism, pyromania, religion and sexual violence. Also several of their songs are allegedly inspired by real-life events. These songs include "Rammstein" (Ramstein airshow disaster), "Mein Teil" (The Meiwes Case), "Wiener Blut" (Fritzl case) and "Donaukinder" (2000 Baia Mare cyanide spill). Their fourth album, "Reise, Reise", is loosely inspired by the crash of Japan Airlines Flight 123. The band have also occasionally delved into politics with their lyrics. "Amerika" is a critic of the cultural and political imperialism of the United States all over the world. The lyrics of the song "Deutschland" contain the lines "Deutschland! / Meine Liebe / kann ich dir nicht geben" (Germany! / My love / [is what] I cannot give you), which conveys the band's inability to have unquestioned patriotic feelings.