In 2006, "Sanctuary", a documentary about the life and work of Gerrard, was recorded and released in September. It is the work of producer and director Clive Collier and features extensive interviews with Gerrard and various people who have collaborated with her in the past, including Michael Mann, Russell Crowe, Hans Zimmer and Niki Caro. The documentary was released on DVD by Milan Entertainment on 24 April 2007. "Sanctuary" debuted at the Raindance Film Festival in London, on 27 September 2006. On 20 November 2006, Gerrard released her second solo album, "The Silver Tree". The album climbed to No. 4 on the "Billboard" New Age Albums Chart on 26 May 2007, spending nine weeks on the chart. This album was markedly different from her previous work and was also her first album released outside 4AD Records. "The Silver Tree" was first released on iTunes, with a wider physical release planned at a future date. The album was nominated for the Australian Music Prize for 2006.