Acoustic band Nickel Creek and singer-songwriter Fiona Apple have scheduled a series of concerts together in August. The 12-city tour begins Aug. 2 in Baltimore and concludes Aug. 19 in Westchester, N.Y. The artists began collaborating at Largo, a club in Los Angeles, sitting in on each other’s sets. For this leg of the tour, Nickel Creek will also serve as Apple’s backing band. Nickel Creek will take a hiatus from touring and recording at the end of 2007.