British singer Amy Winehouse's funeral will take place today and will be attended only by her family and close friends, her spokesman said.A post mortem on the 'Back to Black' singer, who died at the weekend, failed to determine how she died and more toxicology tests are being carried out, with the results expected in two to four weeks, police said.The autopsy was carried out after an inquest opened and adjourned on the 27-year-old's death which police are so far describing as 'unexplained'.Ms Winehouse, who fought drug and alcohol addictions, was found dead at her north London home on Saturday afternoon.As sales of her music soared and speculation swirled about the release of a possible posthumous album, her father Mitch flew in from New York and visited a shrine of flowers, gifts and cards...