It’s been 20 years since Alanis Morissette released Jagged Little Pill, the album that rocketed her to fame.

Back in 1995, her third studio album was expected to sell only modestly, until a Los Angeles rock radio station started playing the angst-ridden first single You Oughta Know.

The next day “there was a line-up around the block and there were people singing You Oughta Know way louder than I was”. Jagged Little Pill went on to sell some 33 million copies and brought Morissette four Grammy awards.

The 20th anniversary collector’s edition includes 10 previously-unreleased demo, a concert video from her live British debut, and an essay by the singer reflecting on that era.

Morissette had been making records since she was 11 years old, but the album and its string of emotion-filled hit singles established her as one of the leading alternative rock female singer-songwriters of the day. As for her famous 1996 single Ironic, Morissette has no regrets.

“I didn’t realise the degree to which the malapropism would trigger this furore. I think people are up in arms about the idea of being stupid and I’m perfectly aware that there’s a big part of me that’s very very dumb and very very brilliant – it depends when you catch me – so I don’t personally care, but I can see it’s a big deal for people,” she said.