When you talk to blues guitarist, songwriter and singer Bob Margolin, you get the sense this is a man who deeply cares about family, friends, those he meets and animals. Those who know him use words like, "He is a very nice man," to describe him. It is perhaps those sensitivities that have infused the sensibilities that he brings to his music, and have made him a highly regarded musician and songwriter. He has shared the stage with music legends such as, Muddy Waters, "Pinetop" Perkins, The B …