In April 1968, the format changed to an "underground" free form format. This short-lived period introduced much of the new voices of "progressive rock" radio, including Michael Tearson and Ed Sciaky. Other voices included popular Top 40 disc jockey Hy Lit from WIBG, and later a popular nighttime show by owner Max Leon's son Steve, who called himself "My Father's Son" on the air. Folk music host Gene Shay also did his program from WDAS-FM at this time.
