Eric Carmen, who rose to fame as the lead singer of the Raspberries and then found greater commercial success as a solo star, has died of unspecified causes at the age of 74. “It is with tremendous sadness that we share the heartbreaking news of the passing of Eric Carmen,” his wife Amy posted on Carmen’s official website. “Our sweet, loving and talented Eric passed away in his sleep, over the weekend. It brought him great joy to know, that for decades, his music touched so many and will be his lasting legacy.” Born in Cleveland, Ohio, Carmen co-formed the power pop pioneers the Raspberries in…