PRESS ASSOCIATION -- Amy Winehouse's family believe her decision to stop drinking may have contributed to her death.
Her father Mitch told mourners at her funeral that he thought his daughter struggled to deal with the sudden withdrawal.
In his eulogy at her funeral service at Edgwarebury Cemetery in north London, Mr Winehouse said she had recently "just completed three weeks of abstinence", adding that she told him: "Dad I've had enough of drinking, I can't stand the look on your and the family's faces anymore."
Earlier this week police revealed they will have to wait up to four weeks for the results of toxicology tests to establish her cause of death.
A post-mortem examination proved inconclusive and an inquest was opened and adjourned with no cause of death given.
Because of Winehouse's battles with drink and drugs, news of her death was quickly followed by suggestions it could be related to one or the other.
The singer was making plans to record a jazz album and wanted to learn how to play a musical instrument according to a recent interview.
She told the Daily Telegraph: "I would love to study guitar or trumpet. I can play a lot of different instruments adequately but nothing really well. If you play an instrument, it makes you a better singer. The more you play, the better you sing, the more you sing, the better you play."
The 27-year-old star gave the interview while recording a duet in the studio with Tony Bennett.
Amy also confided: "I'm not a natural born performer. I'm a natural singer, but I'm quite shy, really... But then the minute you go on stage, everything's OK. The minute you start singing."
Mark Ronson declared Winehouse a "genius" as he performed a special tribute to the late singer.
A day after attending her funeral, the award-winning music producer, who worked with Amy on her second album Back To Black, opened his set at the Greenwich Summer Sessions with a moving rendition of Valerie, accompanied by The Zutons' Dave McCabe who wrote the song.
"It's been a s*** week and it's great coming out to play to you guys - that's the great thing about music," he told the crowds.
Ronson, who was joined by Kyle Falconer from The View, Kurt Hunt from Plastic Little and Phantom Planet's Alex Greenwald, also played a stripped down version of Amy's hit Rehab mid-way through the show, which included tracks like Oh My God, Ooh Wee and Bang Bang Bang.
"I went to her service yesterday and a rabbi said, 'A person's life is measured in deeds, not years', hers was pretty f****** special," Mark said of Amy.
"I'm not getting emotional or morbid but it's nice to share this moment with people who appreciate good music. Amy Winehouse was a genius and has made more brilliant music than I'll ever make."
The 35-year-old invited Charlie Waller of The Rumble Strips on stage for an encore of Back To Black - Winehouse once told Ronson that The Rumble Strips version of the song was "better than ours".
The night ended with another emotional rendition of Valerie, with lead vocals provided by Winehouse's two backing singers, who had supported her for the past 10 years.
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