Elvis Costello, Tom Jones, Sinead O’Connor and George Michael will join forces April 10 for a concert in London to honor the memory of Linda McCartney. Chrissie Hynde is organizing the event, to be held at the Royal Albert Hall. Proceeds will benefit several animal rights groups. Hynde’s band, the Pretenders, will accompany the headliners. Sir Paul McCartney has reportedly approved the event, but it isn’t clear whether he will be there.