The birth of a band can often be an impromptu thing--it can be brought about by the desire of fame, a particularly bad break-up, or sheer boredom. Troy Cole, bassist and founder of Jaafar (Arabic, "forgiveness"), started his band after half of a year of world travel and profound spiritual experience. When this Chapel Hill native returned home from an extended stay in Egypt, he set out on a mission to fuse together the lithe, haunting tones of Middle Eastern music with funk and jazz--not an easy goal. But the very flexible nature of Jaafar--a group which ranges from solo performances to quintets to septets--allows this to happen. Jaafar is world, music, and world-music exploration at its best. See them this weekend at Bakus, performing as an acoustic quartet: bass, percussion and oud, a North African instrument comparable to a lute. Show begins at 7 p.m., 286-0777 for more info.