The Ari Roland Jazz Quartet from New York City arrived in Pakistan about two weeks ago for a series of concerts and music classes with local musicians. The performances are part of a recent stepped-up effort by the U.S. Embassy to sponsor cultural events in Pakistan. Already this year, an American director has staged Neil Simon's play ''The Odd Couple.'' The embassy also plans to bring over a country rock band and a hip hop group as well as American documentary filmmakers who will give workshops to Pakistanis. -Photos by AP