Don Heckman refers to "low overtone harmonies," in his review of the Max Roach Quartet (Jazz Review, April 6).
Six musician friends offered two guesses (multiphonics, primary chords) and four I-don't-knows. Two music dictionaries were no help either.
I give up. What are "low overtone harmonies"?
DAVID M. SHERR
"Multiphonics" is a pretty good definition, says Heckman, who adds that to understand it , it helps to be a saxophone player.