Prince, Village People to Sue The Pirate Bay
While I can see that Village people or Prince might need more money, I very much doubt Abba need anything. It wasn't that long ago that they turned down the offer of one billion dollars to tour again. Björn and Benny make a LOT of money from musicals, with Mamma Mia being a massive hit (it has made around USD 2 billion). Abba had a few more than "one or two hits", and many bands have covered them since. To be honest, I doubt very much if Abba care that the pirate bay is facilitating the sharing of their material. In fact, being Swedish, they're probably cheering TPB on.