Before Kenneth Gamble, Leon Huff and Thom Bell created The Sound of Philadelphia, Jerry Ross created the sound of Philadelphia.  The Philly-born producer-songwriter-entrepreneur penned hits for Diana Ross and the Supremes and The Temptations and produced chart-toppers by Bobby Hebb and Shocking Blue, but only now has his remarkable legacy in pop, rock-and-roll and soul been celebrated on disc.  Ace has recently issued Some Kinda Magic: The Songs of Jerry Ross, a 24-track compendium of Ross’ finest compositions as issued on various labels including his homes of Swan, Cameo-Parkway and Mercury as…