Mastodon is an American heavy metal band from Atlanta, Georgia, formed in 2000. The group is composed of bassist Troy Sanders, guitarists Brent Hinds and Bill Kelliher, and drummer Brann Dailor, all of whom perform vocals in studio (with the exception of Bill Kelliher). They all perform vocals at live shows. Their musical style features progressive concepts and unique instrumentation.

On January 18, 2015, it was reported that Brent Hinds is working on new Mastodon album, showing a picture with him playing the 13 string pedal steel. The same report was later confirmed by Troy Sanders, who stated: "Every record that we do is gonna sound different, because we always want to evolve and create our own musical path. And every record will be different. We do not wanna write the same record twice."  On March 12, 2015, Mastodon released a new track called "White Walker", which will appear on the upcoming Game of Thrones: Catch the Throne Vol. 2 mixtape to promote the fifth season of the HBO TV series Game of Thrones. Dailor, Hinds, and Kelliher also appeared in episode 8 of the season as wildlings. This mixtape will also feature songs by various other acts, ranging from Killswitch Engage to Snoop Dogg. Hinds and Kelliher once again returned to Game of Thrones as wights among the White Walker army for the season 7 finale episode, "The Dragon and the Wolf".  The band's seventh studio album Emperor of Sand was released on March 31, 2017. The theme for the album was cancer, inspired by Troy's wife who was diagnosed with cancer, and Bill's mother who lost her life to cancer. It details the story of a traveller banished to the desert by an emperor, in effect giving him a death sentence. The story is a metaphor for someone diagnosed with terminal cancer. The first single, "Show Yourself", was released in February, and had peaked at number 4 on the US Billboard Mainstream Rock Songs chart in June, making it the band's highest charting song to date. The second single, "Steambreather", peaked at number 18 on the same chart in October.  Mastodon also released an EP titled Cold Dark Place on September 22 of the same year. It was a four-song EP, featuring three songs recorded during the Once More 'Round the Sun sessions, and one track recorded during the Emperor of Sand sessions. The first single for the EP, "Toe to Toes" was released on September 1, 2017. Brent Hinds stated that the inspiration behind some of the songs recorded for Cold Dark Place, which he wrote, were inspired by a nasty breakup that he had endured. Describing the sound of the record, Hinds stated that "I wrote some pretty dark, beautiful, spooky, funky, ethereal, melancholy music, which also sounds like the Bee Gees a little bit." On December 1st, the band released a revised version of the 12 part "The Making of Emperor of Sand" documentary via their official YouTube channel. Mastodon were announced to be on a co-headlining Summer 2018 Tour with Primus spanning across North America lasting from May to July

Answer the following question by taking a quote from the article: Have they toured with other bands during this time?