ANTHRAX is reportedly recording a song for an upcoming "Game Of Thrones" mixtape from HBO. Several new social-media postings of the band in the studio include the #CatchTheThrone hashtag, which has been used to promote HBO's last "Game Of Thrones" mixtape, titled "Catch The Throne: The Mixtape".In addition to ANTHRAX, the next "Game Of Thrones" mixtape is expected to include a song from KILLSWITCH ENGAGE. Released earlier this year via Launch Point Records, "Catch The Throne: The Mixtape" included new tracks from hip-hop artists Big Boi, Common, Wale, Kilo Kish and others, and borrowed themes and storylines from the first three seasons. Each cut on the record sampled music from the original "Game of Thrones" soundtrack. ANTHRAX, along with producer Jay Ruston, is currently in a Los Angeles studio recording the follow-up to the band's 2011 Grammy-nominated, critically-acclaimed album "Worship Music". The group — Charlie Benante (drums), Frank Bello (bass), Joey Belladonna (vocals), Scott Ian (guitar) and Jon Donais (guitar) — has been writing and demoing new songs over the past few months and plans to record well into January. The band's as-yet-untitled eleventh full-length effort is set for a 2015 release via Megaforce. In a recent interview with Canada's "The Metal Voice", Benante stated about the progress of the songwriting sessions for ANTHRAX's next studio album:"Some of the new music that's been coming out for us has been so inspiring. It's, like, I remember telling Scott, we had about 12 songs [in various stages of completion], and I told him, I said, 'Dude, now the good stuff's coming out of me.' And he's, like, 'Really? But these 12 are awesome.' I said, 'Nah, dude. Wait until you hear the next batch.'" He continued: "I write most of the music in the band; the ideas pretty much come from me, musically speaking. But I don't like to… For me, I like everybody to have their input and their say-so. I'll bring in a song and usually me, Scott and Frank [Bello, bass] will play the song and make a change here or there. Or sometimes when Scott gets a riff, he'll kind of modify it a little bit to his own ability, and it just takes shape from there. But for the most part, I just have all these ideas." Benante added: "For this new album, I've been lucky enough to draw from the 'Worship Music' experience and really build on that. So these newer tunes are just… Man, if that record was, like… How can I put this? If that was like 'Led Zeppelin IV', then this one is definitely gonna be like 'Physical Graffiti'. The reason why I said that is because have such an abundance of songs. 'Physical Graffiti' was a double record. We have enough material to have a double record at this point too."