Under the heading "who knew? (no, really, who?)," Kiefer Sutherland is a folk-rock musician about to release his first album ("Down in a Hole") this summer. And when there's an album to promote, a tour can't be far behind: The former "24" star, 49, announced Thursday that starting mid-April he'll take his band on the road to a series of venues around the country, including two on Long Island: the Paramount's Founder's Room (May 25) -- a members-only club that promises patrons "a unique chance to interact with your icons" -- and Amagansett's Stephen Talkhouse (May 28).