Warren’s music has been recorded on Crystal Records. His work with Crystal, along with recorded and live performances have enjoyed frequent airings on national radio including WFMT and WNIB in Chicago, WCRB Boston, Minnesota Public Radio, National Public Radio, WCUW in Worcester (MA), the University of California at Santa Barbara and other university radio stations throughout the United States.
"beauty, vigor and sustained freshness of invention" (Chester Roberts, T.U.B.A. Journal, for Tuba and Piano, commissioned by Rob Orr and reviewed by Chester Roberts [Philadelphia Orchestra tubist, retired; Prof. Emeritus Boston Conservatory] for TUBA Journal. )