question: 2008 European Vacation Tour was a concert tour by American heavy metal band Metallica, an American heavy metal band based in San Rafael, in which U.S. State?
answer: California
context: Title: Metallica
  Passage: Metallica is an American heavy metal band based in San Rafael, California.  The band was formed in 1981 in Los Angeles when vocalist/guitarist James Hetfield responded to an advertisement posted by drummer Lars Ulrich in a local newspaper.  Metallica's current lineup comprises founding members Hetfield and Ulrich, longtime lead guitarist Kirk Hammett, and bassist Robert Trujillo.  Guitarist Dave Mustaine (who went on to form Megadeth) and bassists Ron McGovney, Cliff Burton, and Jason Newsted are also former members of the band.
  Title: 2008 European Vacation Tour
  Passage: 2008 European Vacation Tour was a concert tour by American heavy metal band Metallica.  The tour consisted of three separate European legs and a number of promotional and festival appearances in the United States held during summer 2008.
  Title: By Request Tour
  Passage: The Metallica By Request Tour was a concert tour by American heavy metal band Metallica in support of their single "Lords of Summer", which was released on March 19, 2014.  An interactive tour, concertgoers could vote, via internet, which songs Metallica would include on each night's setlist and, at the concert, via SMS, to a song in the encore.  Metallica debuted a new song, called Lords of Summer.  Metallica's only stop in North America was in Montreal for the Heavy Montreal festival.
citations: Metallica 2008 European Vacation Tour