The funeral of British singer Amy Winehouse was being held Tuesday after an autopsy failed to pinpoint the cause of her death.

Early indications show her music is set to dominate the British singles and albums charts this weekend, mirroring what happened in the weeks following the death of Michael Jackson.

The 27-year-old Winehouse, who had long battled drug and alcohol problems, was found dead in bed at her home in London on Saturday. Her funeral was being attended only by family and close friends, a spokesman said.

An inquest opened Monday and was adjourned until October, with police describing the death as unexplained. More tests are being carried out, with the results expected next month.

Her family was quoted in newspapers as saying they thought she died of a heart attack or seizure. Her boyfriend, Reg Traviss, denied rumors that she died in a drug-fueled haze.

"She had been full of life and so upbeat recently, exercising every day and doing yoga," he told the Sun. "This terrible thing that happened is like an accident."

Record industry body the Official Charts Company said on Tuesday that the singer's music was expected to dominate the British charts.

She is on course to have seven singles in the Top 40 and 14 in the Top 200, with the biggest selling track currently "Back To Black" followed by "Rehab," "Tears Dry On Their Own," "You Know I'm No Good" and "Valerie."

In the year following his death in June 2009 Jackson sold more records in Britain than any other artist.

As she fought drugs and alcohol, Winehouse slid from being a chirpy teenage singer to someone who could barely walk at her final concert performance in Belgrade, Serbia.

The Daily Telegraph newspaper reported Monday that material recorded before Winehouse's death could be released as a posthumous album. They cited sources who said Winehouse had recorded "a lot of material" and that her parents would have the final say on whether a new album was to be released.

Winehouse's spokesman told Reuters there was no news about the release of a third album. "I know there's material about, but no one's talked about it," he said.