Brian Eno composed the famous sound that plays when you start up Windows 95 (Don’t remember it? You can download it here.). Here’s what he had to say about composing it:
The idea came up at the time when I was completely bereft of ideas. I’d been working on my own music for a while and was quite lost, actually. And I really appreciated someone coming along and saying, ‘Here’s a specific problem — solve it.’ 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 3¼ seconds long.’ I thought this was so funny and an amazing thought to actually try to make a little piece of music. It’s like making a tiny little jewel. In fact, I made 84 pieces. I got completely into this world of tiny, tiny little pieces of music. I was so sensitive to microseconds at the end of this that it really broke a logjam in my own work. Then when I’d finished that and I went back to working with pieces that were like three minutes long, it seemed like oceans of time.