Fred Anderson, jazz pioneer and keeper of the Velvet Lounge, had a heart attack on June 14 -- and he died today at age 81. An innovative sax man, Anderson helped found the Association for the Advancement of Creative Musicians (AACM), the kind of free-thinking, creative music organization you just don't see much of anymore. Much of the out-of-the-box jazz this city is known for grew and prospered because of Anderson. He was active to the end, and his energy will be missed.