I am a big Nickel Creek fan. IMO, they are one of the most interesting and amazingly talented groups to come along on the acoustic music scene in years! Though they developed their chops, years ago, playing Bluegrass, their music has evolved into a very different style today. Sara Watkins calls it "High energy chamber music." I think that's a pretty good description. They apparently developed a friendship with Fiona through playing together at Club Largo, in L.A. According to their web site, their August tour dates will include Fiona, and the fans will be treated to expansions of the collaborations developed at Largo. Based on my limited knowledge of Fiona's music (watched a few of her videos tonight), I'm afraid that fans of either group/artist may be disappointed with the results. I have tickets to see Nickel Creek when they come to Florida in November, and am glad they will not be performing with Apple at that point.