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Mraz was born and raised in Mechanicsville, Virginia. He is of Czech and Slovak descent through his grandfather, who moved to the United States from Austria-Hungary in 1915. His surname is Czech for "frost". (Czech: mraz)

In 2009, while preparing for his new album, Mraz recorded "The Way Is Love", an unreleased Roy Orbison song, as a duet with Willie Nelson. In November 2009, he released the live CD/DVD Jason Mraz's Beautiful Mess: Live on Earth, recorded in Chicago during the Gratitude Cafe tour. The following year, he went to Brazil to record "Simplesmente Todo" with Milton Nascimento, who sings in Portuguese while Mraz sings in English. He also did some writing with Dido, and recorded new material with producer Martin Terefe. Mraz then released two live EPs: the Life Is Good EP on October 5, 2010, and the Live Is A Four Letter Word EP on February 28, 2012.  Love Is a Four Letter Word was released on April 13, 2012. It reached number 2 on the Billboard 200, and the top 20 in 10 other countries. The lead single, "I Won't Give Up", debuted at number 8 on the Billboard Hot 100, and number 1 on the Digital Songs chart. It charted in 15 countries in total, and in October 2013 was certified 4x multi-platinum, for selling in excess of 4 million units. Mraz premiered the track live during his 2011 tour, before an official version had been released. It began to receive a lot of attention through live performances, as well as online. The official lyric video gained over 2.5 million views in its first 10 days on YouTube.  Love Is a Four Letter Word was nominated for a 2012 Grammy Award for Best Engineered Album, Non-Classical. Mraz won a 2013 People's Choice Award for Favorite Male Artist. He performed at Farm Aid 2011 in Kansas City. In 2012 he played sold-out shows at the Hollywood Bowl in Los Angeles, Madison Square Garden in New York and the O2 Arena in London, and performed at President Barack Obama and family's lighting of the national Christmas tree at the White House; a noted Obama supporter, he has also performed at numerous other events involving Obama and Vice President Joe Biden. Also in 2012, he performed "You Did It" at the presentation ceremony for the Kennedy Center's Mark Twain Prize for American Humor, won that year by Ellen DeGeneres.
Jason Mraz