This Danish sister duo produced that '98 classic, “This Is How We Party,” which included such poetic lyrics as “Du-bi-du-bi-du-bi-du-bi-du-bi-dub-du-dap-dap.”

If you're a Gen Y girl, you probably first heard S.O.A.P. on one of those Delia's CDs. A Danish pop duo consisting of sisters Heidi and Saseline Sørensen, they toured with the Backstreet Boys in 2000. And then their lives were pretty much downhill from then. Ours, too.