adcelannotate = {"mobilepaywallcategory" : "MOBILE_PREM-LOCAL","nativepaywallcategory" : "NATIVE_PREM-LOCAL"};Bob Prahin, a pianist who was a fixture on the Columbus music scene for decades, died on Saturday. He was 75. Prahin, whose stage name was Bob Allen, will be remembered as a musical legend in central Ohio, said bandleader Rick Brunetto, who considered Prahin a mentor and his dearest friend.