Instead of a single act performing all summer, they have the World Music Concert Series featuring different acts from around the world.
The first act, Bering Strait, was just okay, IMO. Their music is decent for country music but I didn't feel like their performances engaged the audience.
The current performer is Richard Wood, a fiddler from PEI in Nova Scotia, Canada. A very engaging perfomer, his music has a lot of Celtic influence as you might expect of someone from that area of Canada. He also had some step dancers performing with him. Great music and great fun.
The rest of the summer features a group from Africa and a group from Australia (Brother?) as I recall. You can find the full line-up here - just go to the Epcot page.