Music Thing has a great series of posts up on “tiny music makers”, the people responsible for the sound of your Mac/Windows OS starting up, the “Intel Inside” tune, and more.
Brian Eno who composed the Windows 95 tune:
The thing from the agency said, ‘We want a piece of music that is inspiring, universal, blah- blah, da-da-da, optimistic, futuristic, sentimental, emotional,’ this whole list of adjectives, and then at the bottom it said ‘and it must be 3 1/4 seconds long.’