In 2011, it was announced that the Metropolitan Museum of Art would take over the landmark Breuer building that served as the Whitney Museum of American Art’s third home, from 1966 to 2014. With the Whitney now firmly entrenched on Gansevoort St. at the south end of the High Line, the Met is ready to move into 945 Madison Ave., where it will focus on the art of the twentieth and twenty-first centuries. The modernist building, which was designed by Bauhaus-trained architect Marcel Breuer with Hamilton Smith, will open to Met members March 8-13 and to the general public March 18-20, but on March 1 the institution will start offering a unique way for people to familiarize themselves with the short trip between the Met’s main museum on Fifth Ave. and Eighty-Second St. and the Breuer. MetLiveArts has commissioned Mississippi-born American composer John Luther Adams, who won the Pulitzer Prize in 2014 for Become Ocean, to create his first New York City work, “Soundwalk 9:09,” two new pieces that last nine minutes and nine seconds, the amount of time it is estimated it takes to go from the Met to the Met Breuer. “Soundwalk 9:09,” which includes sounds Adams recorded between the two buildings in addition to crowd-sourced material, will be available for free through the Met and WQXR.