Willie "Loco" Alexander (born January 13, 1943) is an American singer and keyboardist based in Gloucester, Massachusetts.He played with the Lost, the Bagatelle and the Grass Menagerie before becoming a member of the Velvet Underground in late 1971, joining fellow Grass Menagerie alumni Doug Yule and Walter Powers and replacing Sterling Morrison, who had gone off to pursue an academic career.With the Velvet Underground, Alexander toured England, Scotland and the Netherlands in support of then-current album Loaded.