There’s no letting up with great music in the city of New Orleans even as the Jazz Fest fades into the past. This evening from 6-8 PM, the singer/songwriter Susan Cowsill plays at the Ogden Museum of Southern Art on Camp Street. Susan rose to fame as a member of the famed Cowsills; the family band that inspired the 1970s television show, the Partridge Family. But she crawled out from under that possible career liability long ago. She has an acerbic wit that will certainly be on display during the interview and Q & A portion of the performance. But it’s her voice, melancholic and filled with heartache or soaring with sheer joy, that will undoubtedly have the place packed.