Photo Credit: Marv Watson

Tool may have premiered new music for the first time in 10 years.

The band also teased some music back in May, but during their set at Tempe’s Monster Mash, Tool debuted “an instrumental track that some fans have dubbed, ‘Descending,’” according to Consequence of Sound.

The track is thought to possibly be featured on the band’s next album, if it even exists. Tool has not released an album since their 10,000 Days in 2006.

You can watch the performance below.

During the same Tempe performance, the band also covered “No Quarter” by Led Zeppelin. You can watch that below.