At their show in Bogata, Columbia, last night, Metallica premiered a new song called "The Lords of Summer".  This is the highest quality audio of the performance we could find for you.  With the recent pictures posted here of the band in the studio and a hint we received from their management firm, we are awaiting a studio version of this track or perhaps another single very soon.  We'll keep you posted.  In the meantime, this sounds pretty riff-tastic.