Abba star Agnetha Faltskog was initially reluctant to launch a career comeback because she feared her voice would be too weak.
The Swedish songstress will release her first album in nine years in May, her record company said this week.
Faltskog hadn't sung professionally for nearly a decade when she started work on the project, and told producer Joergen Elofsson she would give up on the album if her voice didn't sound good enough.
"It was nine or 10 years since I'd sung, so I didn't know if (my voice) worked. I said from the beginning, 'If it sounds old I don't want to do this," she told the BBC.
"I never thought I would sing again, but when I heard the first three songs I couldn't say no."
When You Really Love Someone, the first single from the upcoming full-length release A, was made available on digital music platforms iTunes and Spotify on Monday, along with a music video on YouTube.
A will be released on May 13 and includes the first track co-written by the star in decades, as well as a duet with British singer Gary Barlow of Take That fame.
"I hadn't written music in a very long time but when I sat down at the piano it came to me very naturally," the 62-year-old singer said.
On all the new tracks, Faltskog collaborated with Swedish songwriter and producer Elofsson, who has penned hits for artists including Britney Spears, Kelly Clarkson and Celine Dion.
"She's a musician, a songwriter and singer who hasn't done that for a while. We saw her open up, become much happier, with music again in her life," he said.
Abba, one of the most popular and enduring bands of all time, formed in 1970 and shot to fame after winning the Eurovision contest in 1974.
The band, which has sold more than 378 million records to date, split up in 1982 and has never reunited.
A museum dedicated to the group will open in Stockholm this spring.
"This is a Cinderella story worth telling," former member Bjoern Ulvaeus told reporters last year.
Since the group disbanded more than 30 years ago, fans have never ceased speculating over an Abba reunion. But in the wake of the success of Mamma Mia! - the musical and film based on their hits - Ulvaeus vowed the group would never perform together again."We will never appear on stage again," he told Britain's Daily Telegraph in 2009, adding that he wanted fans to remember the band as "young, exuberant, full of energy and ambition".
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