There is a great new exhibit up in London, about the solar system. It also focuses on the orchestra, with insights from Esa-Pekka Salonen!
There is also a great article on the sound of the universe from Tom Service here. Of course, that author's name made me think of one of my favorite MST3K characters (seen right)!
Right now, San Antonio young musicians are on tour in London, you can read about their adventures here, complete with photos and video!
Besides Holst, there is actual sound from Saturn: