Question: Which American band formed in 1990 perform,ed at the Portland Exhibition Building?

<P0-S0> The Greater Texas & Pan-American Exposition was a World's Fair held at Fair Park in Dallas, Texas (USA). <P0-S1>  The exhibition promoted the city of Dallas as the cultural and economic capital of an emerging Pan-American civilization stretching from Tierra del Fuego to Alaska. <P0-S2>  It followed the successful Texas Centennial Exposition, which was held to celebrate the centennial anniversary of Texas in 1936. <P0-S3>  Every exhibition building constructed for the 1936 fair (except the Hall of Negro Life, which was demolished) were simply redecorated for the event, but most major exhibitors (such as General Motors, Ford and Chrysler) did not return in 1937. <P0-S4>  The event also included the Pan American Olympics, pitting the nations of North, Central, and South America against one another in a series of interracial contests and which led as a precursor for the eventual establishment of the Pan American Games. <SEP> <P1-S0> Rusted Root is an American band formed in 1990 in Pittsburgh, Pennsylvania, by singer-guitarist Michael Glabicki, bassist Patrick Norman and percussionist Liz Berlin. <P1-S1>  The band got its start as the house band playing a weekly gig in Jack's Back Room on Pittsburgh's South Side. <P1-S2>  The band achieved fame in 1994 with its platinum-selling album "When I Woke", which included hit single "Send Me on My Way." <P1-S3>  The song has been featured prominently in many films and commercials. <P1-S4>  Rusted Root has sold more than three million albums. <SEP> <P2-S0> No Bra is an electropop band formed in east London, England, in 2003 by Susanne Oberbeck and Fanny Paul Clinton, who combine electronic pop industrial grooves with sinister Germanic folk. <P2-S1>  The band had an underground hit with the single "Munchausen" in 2005 which was included in Radio 1 DJ's Pete Tong's "best of 2005" list and the Rough Trade best of 2005 compilation. <P2-S2>  The track "Doherfuckher" was used as part of the sound track to Bruce La Bruce's film "Otto or up With Dead People". <P2-S3>  In 2007, the Dutch Scapino Ballet based a ballet performance on No Bra's music which toured around Europe. <P2-S4>  Despite claiming to be "not gay," No Bra's Susanne was nominated as their gay icon by influential British post punk band The Raincoats and asked to perform with them at the gay icons exhibition at the national portrait gallery in London in 2009. <P2-S5>  No Bra also appears in the upcoming documentary about The Raincoats. <P2-S6>  The musician's image has inspired several visual artists such as Christophe Chemin and Brian Kenny and photographer Wolfgang Tillmans. <SEP> <P3-S0> The Portland Exposition Building, also known as The Expo, is a sports and exhibition venue (convention center) building complex in Portland, Maine. <P3-S1>  The complex includes five inter-connected buildings with 330,000 square feet of exhibition space and 10 meeting rooms. <P3-S2>  The Center is adjacent to the Hadlock Field and the Portland Ice Arena. <P3-S3>  Phish, Ani Difranco, Natalie Merchant, The Monkees, and Rusted Root have played at the venue. <P3-S4>  It has also hosted trade shows and celebrations. <P3-S5>  It has been used for the Maine Red Claws basketball team, Portland High School Bulldogs basketball games, and indoor track events. <P3-S6>  In 2007, the Expo became the home of Maine Roller Derby.