Power Metal is a generally up-beat metal genre consisting of fast guitar hooks and catchy tunes, often associated with neo-classical metal and progressive metal, and occasionally glam metal. The earliest influences of power metal are traced back to 1976 when the musical group Rainbow(led by Ronnie James Dio) released the track, "Stargazer". The track is widely considered the first power metal song. The genre achieved widespread popularity through Helloween's 'Keeper of the Seven Keys' albums. Helloween, with artists Blind Guardian and Stratovarius, are considered the pioneers of the genre.