Berklee is giving one of the city's best music events some new energy as the college assumes production of Boston's annual BeanTown Jazz Festival. Last year, more than 40,000 music lovers attended this civic celebration, held on three outdoor stages in Boston's South End. This year's festival, the sixth annual, will be held September 29 through October 1, 2006, again with lead sponsorship by Sovereign Bank. A portion of the festival proceeds will support prostate cancer research and awareness and Berklee City Music, the college's youth outreach program.