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, Alexander was invited to join one of the most influential bands of the '60s after its leader departed. He played keyboards and sang until Yule and the rest of the skeleton crew called it quits in 1972, after the album Squeeze.