Within Temptation is a Dutch symphonic metal band founded in April 1996 by vocalist Sharon den Adel and guitarist Robert Westerholt. They have always been classified by critics as gothic metal, although the "gothic" influence varies with each album. Their most prominent and well-known sound is described as symphonic metal, although their earlier material, such as debut album Enter, was mostly gothic metal, with Enter also having a hint of doom metal. In an interview, den Adel said they fell into a symphonic rock genre with various influences. In a later interview with Dutch music platform 3VOOR12, den Adel stated that "we consider ourselves more a symphonic rock band ... in my opinion, we are no gothic band".
The band's first album, Enter, was released in 1997, in which music critics defined the band as two heavy metal subgenres, gothic metal and doom metal classifying the release as "gloomy, doomy, slow moving, atmospheric, symphonic gothic metal." and compared it with Tristania and Theatre of Tragedy, two other bands in the genre. The guitar riffs and keyboard work were also praised as were the contrasting voices of the two lead vocalists, Sharon den Adel and Robert Westerholt.