Spectrelight

This song features vocal assistance from friend of Mastodon, Scott Kelly of Neurosis. Vocalist and bassist Troy Sanders told Kerrang!: "This is probably the heaviest track on the album. Scott Kelly from Neurosis sings the vocals on the middle section. I think this is the fourth album in a row that he's been on for us, and it came together really nicely with him. The song itself is tough as nails. It's got quite the brutality going on. It's a complete scorcher. It's a face-melter."

Guitarist Bill Kelliher told MusicRadar.com this was a song that Dailor "mostly came up with." He added: "When we got into the studio, I changed around some parts. I dropped down the tuning to make it sound more evil. It was a little too happy at first, so I tuned it down to A again.

The magic glue to the song is the little staccato bit that holds sections together. (Producer) Mike Elizondo and I butted heads on that – he thought it was unnecessary, but I stuck to my guns. There's a lot of open, dissonant notes on it – I like how crazy and twisted they sound. Open notes give you a warbly texture."