Mike Sullivan, guitarist for Chicago instrumental post-metal outfit Russian Circles, has shared a heartfelt story about Tool guitarist Adam Jones.

In a post shared on Instagram roughly a week ago, Sullivan reflected on Russian Circles' 2007 UK tour supporting Tool.

The show marked Sullivan's first time using rented amplifiers overseas and things did not go smoothly.

He struggled to get any sound from the rented gear during soundcheck and was further complicated by a union-run venue prohibiting noise after a certain cutoff time.

Moments later, there was a knock at the band's green room door.

Adam Jones politely introduced himself and asked about the amplifier issues.

Upon hearing what had happened, Jones offered an immediate solution: he would have his guitar tech set up Tool's backup amp rig behind Sullivan's setup, just in case things went wrong onstage.

This gesture was one of the most kind and thoughtful experiences of my life, said Sullivan.

Taking the stage, knowing Adam's amps were there as a safety net, completely calmed my nerves, he added.

The experience left a lasting impression on Sullivan who noted that he and his bandmates still use Jones' humility and generosity as a benchmark for how they aim to conduct themselves.