 Prince Charles and the Duchess of Cornwall grinned with delight as they were given a loud welcome to Tanzania yesterday by a brass band.  a saxophonist and trombonist from the 12 wind group blasted out their tune as they crouched a couple of yards from the couple, who met the Tanzanian Prime Minister Mizengo Pinda.  Fantastic,  the prince said to  the PM, while his wife said:  It s  so loud.  The couple, on a three-day tour of the former British colony, grinned and waved at the performers during the sunset show in the major commercial city of the country, Dar es Salaam.  around 15 drummers and more than 25 dancers completed the energetic troop alongside the red carpet.  One of the themes of this Commonwealth tour is climate change. Earlier, in a speech at Cape Town University, South africa, the prince said:  My wife and I are seeing how a diverse range of rural and urban communities are facing up to these challenges.