Enya didn't receive much notice, but Enya and the Ryans' second effort, Watermark, became a surprise hit upon its release in 1988. "Orinoco Flow," the first single, became a number one hit in Britain, helping the album eventually sell eight million copies worldwide. Enya spent the years following the success of Watermark rather quietly; her most notable appearance was a cameo on Sinéad O'Connor's I Do Not Want What I Haven't Got. She finally released Shepherd Moons, her follow-up to Watermark, in 1991. Shepherd Moons was even more successful than its predecessor, eventually selling over ten million copies worldwide; it entered the U.S. charts at number 17 and remained in the Top 200 for almost four years.Again, Enya was slow to follow up on the success of Shepherd Moons, spending nearly four years working on her fourth album. The record, entitled Memory of Trees, was released in December 1995. Memory of Trees entered the U.S. charts at number nine and sold over two million copies w...