Manowar's mythological sword and sorcery lyrics influenced a number of power metal bands. Throughout the early 1980s especially in the years 1982 and 1983, a US power metal style first emerged from traditional heavy metal, NWOBHM, and thrash/speed metal influences. The exact first origin is often contested, but bands such as Cirith Ungol, Jag Panzer, Manilla Road, Omen, Riot, Savatage, and Warlord are thought to have influenced the earliest development of the style. More concretely, in 1987 German band Helloween released their second album, "", cited by AllMusic as "a landmark recording that remains arguably the single most influential power metal album to date. Its volatile combination of power and melody would inspire an entire generation of metal bands". This release influenced a European power metal style to evolve, which proliferated throughout the globe and since the start of the 1990s is still the most commonly heard style of power metal. Power metal is today associated with fast tempo and melodic harmonies, the sound tempered by characteristics of speed metal, power metal's musical forerunner. Power metal is highly focused on the vocalist, with "clean" vocals being much more prevalent than the growling vocals often associated with extreme metal. Inspired by Ronnie James Dio, Bruce Dickinson, Rob Halford, Geoff Tate, and other rock and heavy metal vocalists, power metal vocals are often in a high register, and the singer's vocal range is usually wide. The majority of the genre's vocalists sing in the tenor range and are capable of hitting very high notes, for example Timo Kotipelto of Stratovarius, Tony Kakko of Sonata Arctica, Michael Kiske (Helloween) and Andre Matos (ex-Angra). There are many exceptions who sing in either baritone or bass range. Some vocalists sing in a harsh, thrash metal style, including Chris Boltendahl of Grave Digger, Kai Hansen of Gamma Ray and Peavy Wagner of Rage and Wintersun's Jari Mäenpää. Many power metal vocalists, most notably Hansi Kürsch of Blind Guardian, record multi-layered vocals reminiscent of Queen creating a choral effect. Themes that frequently feature throughout other metal subgenres, such as religion and politics, are comparatively rare in power metal - albeit not unheard of. Power metal's lyrical themes often focus on fantasy and mythology, camaraderie and hope, personal struggles and emotions, war and death, or combinations of the aforementioned.