Well when i grew up in the 70's Abba was a lot on the radio at my parents place and altough I'm a metal head i really like Abba,always did.They are very good musicians and those girls can really sing.It's pop but not the typical pop IMO,they have a high degree of musicality and those 2 voices did complement each other very well.
Also the mixing of their albums was top notch for being the 70's.
Anyway my favorite Abba song is Dancing Queen.
I agree with you MJMP, in fact I'll go as far as saying all pop music was better years ago. I hate to be stuck in the past but guys like Duran Duran for example can really f**king play. I'd say pop declined steadily since the 90's until now. Ultimately I don't give a shit but when I find that I can enjoy older pop music and yet I despise what I hear from those X factor bullshit shows and other shit like One Direction. Its f**king sad state of affairs modern pop music. But then what do I know???
Abba were good musicians for sure no doubt. I just don't get out of bed in the morning to listen to them. But I do for Judas Priest, Accept and Mercyful Fate hahahah
Here is an addition to an epic album list,
Judas Priest - Ram it Down (I love the guitar sound they had around then although many people hate it)
Atom kraft - Future Warriors