Yesterdays just a memory, tomorrow is never what its supposed to be, and today the Skirball opens Bob Dylans American Journey, 19561966. Included in the exhibit are handwritten song lyrics, posters and a recording of his first-ever, never-released concert. Theres even an area where you can play drums with Bob, sorta but not really. Related films and other programs, including an instrument-making workshop for kids, happen every week. Skirball Cultural Center, 2701 N. Sepulveda Blvd., L.A.; Feb. 8June 8; $10, $7 seniors & students, free on Thursdays. (310) 440-4500. Tuesdays-Sundays. Starts: Feb. 8. Continues through June 8, 2008