It seems there were always a few groups that just weren't on the tips of the tongue of music lovers and radio listeners. Abba was one although in my area of the country, they had lots of hits and plenty of airplay, enough to say they were among the top played groups/artists. I just knew nothing about them except the occasional American Bandstand appearance. I never saw displays in record store and never heard factoids about the group mentioned by jocks. Another group that seemed much like Abba was The Grass Roots...plenty of hits, lots of airplay but no displays in record stores or any of the other things that gave the listener much knowledge of the group.