The poignant version of Paolo Nutini's Autumn, recorded by 16-year-old Sarah Phillips, became a sensation after being posted on the internet.
On the evening that her mother Debbie died last month, Sarah sang the song alone in her bedroom, recording it on her mobile phone.
A little over four hours after the pitch-perfect song was recorded, Mrs Phillips, 48, died with her family at her bedside.
The song was played at Mrs Phillips' funeral and was uploaded as a lasting memorial on to YouTube, along with treasured video footage of family holidays.
It received more than 200,000 hits within days, and the family hopes that releasing the song as a single can help their fundraising efforts to help fight cervical cancer.
Proceeds from the single, released on iTunes, will be added to more than £67,000 which has been raised so far for the Debbie Phillips Cervical Cancer Research Fund.
Sarah, from Chiswick, west London, said: ''The response to the video has been amazing. I sang the song as a tribute to my mother.
''I hope that people buy the song and that we raise lots of money to help other women who suffer from cervical cancer.''
Family friend Charlie Mole, who is a songwriter and score composer, added a musical arrangement to the song, keeping the original vocal recording intact.
Sarah's barrister father Mark Phillips QC, met his wife - who was brought up in Sheffield - at Bristol University 30 years ago.
Mrs Phillips, a high-flying student who obtained a first class degree, became a solicitor at prestigious City law firm Freshfields, later devoting her time to bringing up the couple's three children.
During a family holiday in 2006, Mrs Phillips was told that medical tests had revealed a serious problem.
Within days, she had undergone surgery for cervical cancer.
By 2008, the cancer had spread to Mrs Phillips's brain and she was eventually left unable to see.
Mr Phillips, 50, said: ''My wife Debbie fought cancer with grace and dignity for four years.
''During that fight we discovered that there was no research going on specifically into cervical cancer anywhere in the world.
''Debbie and I felt that we needed to try to do something to help doctors improve the detection and cure of cervical cancer, which affects many young women and mothers like her.''
The family have set up the Debbie Phillips Cervical Cancer Research Fund together with the University College London Cancer Institute Research Trust to help finance research into cervical cancer.
He said: ''I'm incredibly proud of my daughter and of this beautiful song. The love of Sarah for her mother is so evident in this song, and it's captured the imagination of listeners worldwide.
''That's why we've decided to release it as a single to raise money for research into cervical cancer.''