In a brand new interview with U.K.'s The Guardian, MOTÖRHEAD frontman Lemmy Kilmister was asked about the group's June 26 performance at the Glastonbury Festival in Glastonbury, England where he and his bandmates followed "Ace Of Spades" with "Overkill", but Lemmy continued to sing "Ace Of Spades" (see video below). "It was a mental block," he said. "I've sung those songs so many times. First time I've ever sung 'Ace Of Spades' to it, though. We did it the night before and it was fucking terrible, and I swore I'd never do it again. But we did. Obviously."

In 2013, Lemmy underwent an operation to implant a cardioverter-defibrillator into his chest, a device that helps prevent an irregular heartbeat turning into no heartbeat. Then, shortly afterwards, he suffered a hematoma. Earlier this year, MOTÖRHEAD was forced to cancel shows after he suffered a gastric illness.

Lemmy has cut back on booze and cigarettes — he's down to a pack a week, and has swapped from Jack and Coke to vodka and orange, apparently to help with his diabetes.

He told The Guardian: "I like orange juice better. So Coca-Cola can fuck off."

The singer and bassist said that he has to walk with a stick because his legs "are fucked," but he added: "Apparently I am still indestructible."

And he insisted the only way MOTÖRHEAD will stop performing is if he dies. "As long as I can walk the few yards from the back to the front of the stage without a stick," he said. "Or even if I do have to use a stick."

MOTÖRHEAD's 22nd studio album, "Bad Magic", will be released on August 28. The CD was recorded at NRG Recording Studios in North Hollywood with longtime producer Cameron Webb.