Musically, glam metal combines a traditional heavy metal sound with elements of hard rock and punk rock, adding pop-influenced catchy hooks and guitar riffs. Like other heavy metal songs of the 1980s (most notably thrash metal songs), they often feature shred guitar solos. They also include extensive use of harmonies, particularly in the characteristic power balladsslow, emotional songs that gradually build to a strong finale. These were among the most commercially successful singles in the genre and opened it up to a wider audience that would not have been attracted to traditional heavy metal. Lyrical themes often deal with love and lust, with songs often directed at a particular woman.