First, go here and here and here to read entries by one of my heroes, Andrew Bird, about the process of songwriting. His entries are found along with those of Suzanne Vega, Rosanne Cash, and Darrell Brown in the New York Times blog "Measure for Measure" -- link at right.
I wanna -- er, WILL -- play harp with:
Explosions in the Sky
The Arcade Fire
Deborah Henson-Conant -- (again)
Andrew Bird (MySpace page)
Absolutely, unquestionably, harp fits perfectly with all of them.