Popular throughout the world, Enya plummeted into the public eye when her second single, Orinoco Flow (Sail Away), reached number one in  the British pop charts. Four best-selling albums and several singles have so far followed, gaining her a large fan following outside her native Ireland (America, in particular, where 'Shepherd Moons' had an unbroken run of 199 weeks in the Billboard chart).
Variously described as New Age, Easy Listening, Contemporary Classical, or just plain Pop, Enya's music fits into the unclassifiable category best described as 'um'- not silly enough to be New Age, too classy to be pop, and too emotionally involving to be easy listening. Rug-pulling chord changes, swathes of choral sounds, with lyrics so transparent (and multi-lingual) that the sound is more important than the meaning, and more synthesizers than you could shake a particularly big stick at are the order of the day.

 You know when you're watching a telvision programme where there's a camera shot taken from the bottom of a helicopter, and the helicopter's rushing over fields and hills at great speed, and then it zooms unexpectedly over the edge of a canyon, and you suddenly find yourself looking at a giant panorama of landscape for miles around, and your stomach seems to sink into your feet as your brain tries to take everything in?
Well, imagine that multiplied by a big number, and then double it. That's the kind of effect that looking at a single page of the sheet music for any one of Enya's songs can have. Even on people who can't read music.