The "cloud" isn't some silent, nebulous power. The computing power necessary to run everything from Steam to Xbox Live to your phone's email comes from data centres, and while they look cool, they sound like the internet is built on steam pipes and diesel.
British sound artist Matt Parker took a trip to a data centre at Birmingham City University-Edgbaston, and recorded what he could hear. Note that this isn't even a big data center.
If for whatever reason you want to hear more of this stuff, Motherboard has rounded up some other examples