I've heard it played through an iPhone, desktop computer, and my shitty kitchen radio (through NPR). the first two, it sounds like Yanni. Through the radio, it was obviously Laurel. Assuming this is always the same digital sound file, it's wholly dependent on the speakers, or possibly whatever acoustic properties in the room, which is kinda cool.
Coworker that brought this to us, said the same: in her apartment listening on her phone, it was clearly Laurel. In our office space at work, using the same phone, it was clearly Yanni to everyone in the room. Weird.