The music is via ZerOKilledMusc (founded by the gentleman who wrote the lyrics to the song below, Constanza Francavilla). They are not just a record label but a publishing company, licensing agency and more.
They did music not only for The Hunger Games but for Battleship and Coriolanus (the Ralph Fiennes directed Shakespeare adaptation that they theater near me showed previews for for a year and then never showed the damned movie).
For more info head to www.t-t-l-music.com or to www.zerokilledmusic.com.