SATURDAY Graceland: The African Concert (PBS, 9-10:50 p.m.): Two dozen South African artists - like Ladysmith Black Mombazo - add their talents to Paul Simon's in this film of a 1987 concert he did in Zimbabwe. About half the songs are from Simon's acclaimed ``Graceland'' album, with scenes from African life integrated into the stage performances. SUNDAY The 30-Minute Movie (Showtime cable, 9-10:30 p.m.): Call it the cinematic version of the short stories or just a TV departure - in any case, this new series offers directors a crack at the 30-minute format. Hosted by Rob Reiner, the three very different opening films range in themes from from time traps to homelessness. Wolves (PBS, 8-9 p.m.): Wolves are getting very popular in TV documentaries - especially when it comes to efforts by conservationists at restoring them in areas anywhere near livestock. This National Audubon Society special looks at several attempts. WEDNESDAY American Masters (PBS, 9-10 p.m.): Sometimes a person behind the scenes - or in this case in back of the mikes - can be as important as the performers. One example is record-producer John Hammond, whose impact on five decades of pop singers - from Count Basie to Bob Dylan - is explored in this ``American Masters'' show, which offers Hammond's own recollections with interviews, previously unseen clips, and other revealing sources. Please check local listings for all programs, especially on PBS.