But Meyer and his sharia compliance officer, Sheikh Yusuf DeLorenzo, say they have cracked the code.

FORBES: Hedging

Now touring with a new self-titled album, the singer-songwriter, along with band members Paul Defiglia on upright bass and drummer Malachai DeLorenzo, performed from Nashville and spoke with Weekend Edition Saturday's John Ydstie.

NPR: Langhorne Slim's Folk-Rock Live Wire

Sheikh Yusuf Talal DeLorenzo, 59, is one such top scholar and works from a Toll Brothers (nyse: TOL - news - people ) mansion in the suburbs of Washington, D.

FORBES: Don't Call It Interest

"It's a limited specialization with limited practitioners, and even among the people with the specialization only a handful are suitable for working with international financial institutions, " said Yusuf Talal DeLorenzo, a U.S.-based scholar who is one of the chosen few.

FORBES: The Enforcers