Upon its release, Van Halen reached No. 19 on the Billboard pop music charts, one of rock's most commercially successful debuts. It was highly regarded as both a heavy metal and hard rock album. The album included songs now regarded as Van Halen classics, like "Runnin' with the Devil" and the guitar solo "Eruption", which showcased Eddie's use of a technique known as "finger-tapping". The band toured for nearly a year, opening for Black Sabbath and establishing a reputation for their performances. The band's chemistry owed much to Eddie Van Halen's technical guitar wizardry and David Lee Roth's flamboyant antics and stage persona, strong points which later made them rivals. The band returned to the studio in late 1978 to record Van Halen II, a 1979 album similar in style to their debut. This record yielded the band's first hit single, "Dance the Night Away."