Here's a cheery lttle organ piece he wrote when he was just a young 'un (maybe 22). Played on an organ made later in his lifetime in 1738. Put on a good pair of headphones and crank up to 11
"This recording was made on the famous Müller organ in the Great or St. Bavo Church, in Haarlem. It is a very special instrument from 1738. Both Georg Friedrich Händel and Wolfgang Amadeus Mozart travelled to Haarlem to play this organ.."
I first heard about this a couple of years ago when the YouTube clip below was made and have been waiting for the CD to come out. Finally, it will be available as of May 5.