When did the Cardigans become the saddest band in the world? The latest from the Swedish quintet, which hasn't released a Stateside CD since 1998's electro-romp ''Gran Turismo,'' is morose (''And Then You Kissed Me'' is a tale of spousal abuse) and country-flecked. But Nina Persson's tender voice, coupled with the Cardigans' welcome desire to explore new musical territory, allows this once-fizzy group to pull off a sultry coup.

