ABBA is a truly glam-rock band! See this list of rock-bands: https://en.wikipedia.org/wiki/List_of_glam_rock_artists And fresh BBC movie from 19:20 - ABBA is a truly glam-rock band https://www.dailymotion.com/video/x5ik7jp ABBA's famous rock style songs: Waterloo, Ring Ring, So Long, SOS, Get On Carousel, I'am marionette, Does your mother know,Why Did It Have to Be Me?, The Visitors, Like an Angel Passing Through My Room, and many more. Look at "ABBA: The Movie" by Universal 1977. Most of the time at 11's live perfomances in Australia, rock music played. Their soft rock was listened by millions families, elders and children. More people watched an Abba-in-Australia TV special than had viewed the moon landingspecial than had viewed the moon landing. The most popular song SOS is prog pop style (progressive rock+pop) and all their songs seem to always translate well into metal covers. Song "I'am marionette" is rock style and truly metalic according to a lot of opinions, and was included to all their live concerts until 1977 Wembley 1979 live perfomance..There were used so many drums that are not used in pop music, and they are used by rock musicians. https://www.youtube.com/watch?v=JMU4HhqLT-M
They got to love rock even those who were generally indifferent to music and those who had rock associated with drugs, chains and tattoos, but they were stays cleanest. ABBA had done more for rock than The Beatles.