 They continued to mix their style of "bombastic, symphonic and cinematic" metal with a gothic atmosphere on their next albums "Dark Passion Play" in 2007 and "Imaginaerum" in 2011.In the book Rough Guide to Heavy Metal, Essi Berelian describes Nightwish as "gothic film score metal".The Swedish group Therion also introduced gothic elements to their brand of symphonic metal on their 2007 album "Gothic Kabbalah".