This year marks the 20th year for Richardson's Wildflower! Art & Music Festival, and lineups from fests past have always offered something from every decade and genre. A couple artists stand out this year: Friday has '70s funk icons Chic, St. Louis rapper Nelly and Motown legends The Commodores. Saturday's lineup includes Dallas' own electro-pop act Zhora, Lou Gramm of Foreigner fame and Florida's acoustic emo band Dashboard Confessional. A gallery of tribute bands are also slated for the festival, including Abba-mania (ABBA), A Hard Night's Day (The Beatles), Swan Song (Led Zeppelin) and Le Cure (well ... the Cure). Tickets are $20 for one day, $30 for all three days.