Metallica have officially released new song “Lords of Summer” on iTunes.

In launching the song, the band said “Along with the longest day of the year comes the release of "Lords of Summer" on iTunes worldwide.

If you joined us for a show or two in South America or on the first leg of the European tour you will recognize it as the “new song” in the set. Our friends over at ESPN heard it and decided they want to kick off their summer by spinning it on and off all day Saturday, so you just might hear it again if you’re a sports fan in the States.”

Clocking in at 8:20, the recording is slightly different to the version streamed on YouTube and released on “It’s still a work in progress, but we wanted to share it with you as it stands today,” the band said. “It most probably will change again.”