Brian Carpenter is the host of Free Association, a free-form radio show broadcast from WZBC-FM Boston College with occasional special guests. Brian Carpenter is an American singer-songwriter, composer, arranger, and producer. He founded Ghost Train Orchestra (Brooklyn NY) in Brooklyn in 2006 and has led the Boston-based band Beat Circus since 2004. Since 2001, Carpenter has produced several radio documentaries on Free Association, including an in-depth examination of sound design in horror and science fiction films.