ABBA was nothing to do with soul, in the same way that James Brown was nothing like Beethoven - what a completely daft comparison, clivex! They made a lot of moribund parties get up 'n' go, and I don't know anyone who doesn't want to make an arse of themself to 'Dancing Queen'. They had a unique sound and definitely a unique look (!) and they've stood the test of time in that people still play them.
James Brown ended up as a parody of soul, cheesy and kitsch, and sadly, madly self-deluded that his horrendous polyester jumpsuits suits and bouffant hair made him a sex god. Bouffant hair and polyester jumpsuits on the ABBA boys, meanwhile, just looked like a normal part of the package!