Azita Youssefi has been making music in Chicago for 30 years. Thomas Comerford The first time you see "If U Die," the new video from Chicago singer-songwriter Azita Youssefi, it might take you a minute to realize that the colorful rock band you're watching is actually four matted-together versions of a single person. It's Youssefi in every role: the shaggy, smiling bassist, the bespectacled guitarist wearing a red realtor blazer, the blonde lead vocalist in blue eye shadow with a scarf at her neck, and the cool, denim-clad drummer hiding behind shades. None of the characters reveals anything about Youssefi personally, except perhaps her expert sense of show. But the video is more than a visual joke; it's a reflection of the multifaceted musicianship she's developed in real life. On the new