Although relatively unknown outside Boston, Willie "Loco" Alexander is familiar to rock trivia experts as the answer to the brain-teaser: Who took Lou Reed's place in the Velvet Underground? He was born in Philadelphia in 1943, but emigrated to Boston in the '60s, where he formed the folk duo Baba & Willie Loco. Alexander founded the Lost in 1964, one of Boston's most popular garage bands of the period, and recorded for Capitol during the mid-'60s. By 1967, he was playing in Glass Menagerie with Doug Yule (who joined the Velvets one year later, replacing John Cale); in 1970, A...