II in 2000. Vietnam Vietnamese prime minister Nguyễn Tấn Dũng met with Benedict at the Vatican on 25 January 2007 in a "new and important step towards establishing diplomatic ties". The Pope met with Vietnamese president Nguyễn Minh Triết on 11 December 2009. Vatican officials called the meeting "a significant stage in the progress of bilateral relations with Vietnam." Global economy In July 2009, Benedict published his third encyclical, Caritas in veritate (Charity in truth), setting out the philosophical and moral foundations for human development, individually and collectively, in striving for the common good. This was the last encyclical of Benedict XVI's papacy. Caritas in veritate makes a case for the charitable distribution of wealth in considerable detail and discusses the environment, migration, terrorism, sexual tourism, bioethics, energy and population. The Financial Times reported that Benedict's advocacy for a fairer redistribution of wealth helped set the agenda for the 2009 July G8 summit. Also included in Charity in Truth is advocacy for tax choice: One possible approach to development aid would be to apply effectively what is known as fiscal subsidiarity, allowing citizens to decide how to allocate a portion of the taxes they pay to the State. Provided it does not degenerate into the promotion of special interests, this can help to stimulate forms of welfare solidarity from below, with obvious benefits in the area of solidarity for development as well. Nuclear energy Benedict called for nuclear disarmament. At the same time, he supported the peaceful use of nuclear energy as a tool for development and the fight against poverty. In his message for the 50th anniversary of the founding of the International Atomic Energy Agency, he confirmed: "The Holy See, fully approving of the IAEA's goal, has been a member from the organisation's foundation and continues to support its activity." Personal life Benedict was known to be deeply interested in classical music, and was an accomplished pianist. His favourite composer was Wolfgang Amadeus Mozart, of whose music he said: "His music is by no means just entertainment; it contains the whole tragedy of human existence." Benedict also stated that Mozart's music affected him greatly as a young man and "deeply penetrated his soul". Benedict's favourite works of music were Mozart's Clarinet Concerto and Clarinet Quintet. He recorded an album of contemporary classical music in which he sings and recites prayers to the Blessed Virgin Mary. The album was