by Tia S. Yang, Staff Writer Local advertising legend Les Waas, 94, the man responsible for two of the most recognizable tunes ever heard in Philadelphia - the Mr. Softee jingle and "Everybody Who Knows Goes to Melrose" - died Tuesday, April 19, of pneumonia at Abington Hospice in Warminster. He was a Philly native and a Philly original. A graduate of Olney High School (Class of 1939), a sheet-metal worker at the Navy Yard, a World War II Army Air Corps pilot, and a world-class prankster, Mr. Waas turned a knack for writing jingles into an enduring legacy. His beginning was ordinary enough. He went to work at the Navy Yard after graduating from Olney, and enlisted in the Army in 1942. (He flew C-47 transport planes in the Pacific theater.) But after he was discharged in '46, Mr. Waas made a drastic change. He entered the advertising business. And by the 1950s, despite not having any formal training, he founded his own ad agency, Waas Inc. He produced live commercials for TV and radio personality Sally Starr, and for Dick Clark's American Bandstand when the show was still airing from West Philly. Working from a studio in his Huntingdon Valley home, Mr. Waas wrote and produced almost 1,000 jingles throughout his long career. His clients included Holiday Inn, the Coast Guard, Acme Markets, and the Phillies, in addition to the Melrose Diner. He wrote the Mr. Softee jingle, which still plays from ice cream trucks today, in 1960.