lastFM says it nicely:
"Yeasayer (pronounced "yay-sayer") takes place in the future, somewhere in the Middle East where citizens wear turquoise robes, live in crystal towers, and overindulge on Peter Gabriel albums. The band members are Anand Wilder, Chris Keating, Ira Wolf Tuton, and Luke Fasano. They describe their music as "Middle Eastern-psych-snap-gospel". The band first came to national attention after appearing at the SXSW festival in early 2007."