Grindmother gears up for grindcore comeback with lots to scream about after 5-year hiatus

Back in 2015, Rayny Forster's mom was goofing around with her son's grindcore band in Windsor, Ont.

Grindcore combines hardcore punk and aggressive guitar riffs, with a lead vocalist screaming mostly indecipherable lyrics.

Rayny's mom grabbed the mic, screamed out some political lyrics and got a taste for the genre.

Forster filmed that session and the resulting video went viral. It began a whirlwind two years of interviews, recording and touring for the now 74-year-old grandmother, who has been private about her real name and uses Grindmother onstage.

Now, Grindmother wants to make a comeback.

It's been five years since Grindmother's last performance.

Grindmother and her 44-year-old son's band released one 10-song album, Age of Destruction, in 2016.

"I've missed it during the time we took the break," said the former social worker, who celebrates her 75th birthday next month.

Between 2016 and 2018, she toured with her son around Canada and the U.S., with stops in Japan and Germany.

WATCH: Grindmother records vocals at home studio:

"One of the things that inspires me is that there are a lot of things to scream about right now," said Grindmother.

She's been visiting her son in London, Ont., this month, where he now works for a cannabis company. 

"The way the planet is going, and bombs and fighting, and not enough food for people — there are lots of things that aren't fair."

Grindmother thinks about all that when she's screaming. One song, Mother Nature, starts with the lyrics, "Mother Nature deserves our respect. Instead, she is under attack."