Even if Christopher Guest won't officially admit to it, there is a similarity between Leventhal and the promoter in AMW.   Leventhal was the real-life counterpart and Guests inspiration.   Watch "Wasn't That A Time" and you will see the similarites - the Weaver's getting together at the picnic, just like Guest's group in A Mighty Wind. The similarity ends there, as Leventhal was sincere in his work and the artists that he represented were not out to make a quick buck. Guest chose to exploit the commercial side of the business.

Ron,

Like most of the characters in A Mighty Wind, the fictional promoter to whom they were paying tribute was inspired by more than one person. It was obvious, to me at least, that the promoter's story certainly took inspiration from both Harold and from Manny Greenhill.