There will be jazz around the clock in Philadelphia next weekend during the fourth annual Spectacor Presidential Jazz Weekend Friday through Sunday.

Regional and international artists will perform in a variety of rhythms and styles, from the sophisticated sounds of Mercer Ellington and the Duke Ellington Band to the Afro-Latin beat of Papo Vazquez Bomba Jazz.

As a tribute to jazz musicians Miles Davis and Lee Morgan, 14 regional jazz ensembles will take part in "Jazz 'til Sunrise," an all-night review beginning at 10 p.m. Friday and continuing until 6:30 a.m. Saturday at the Afro-American Historical and Cultural Museum. In addition to five headliner concerts, the more than 90 scheduled events include workshops for children, a multicultural craft bazaar, a bus tour of neighborhood jazz clubs, a jazz laser show, tours of Philadelphia's historic sites, jazz brunches, lunches and other activities. Call (215) 636-1666.