Song of the Cicada

The 17 year cicadas are swarming everywhere. I found a lone tree out in the middle of a prairie, and they were all gathering on this one tree making a huge ambient noise. I am familiar with the annual cicada sound but these 17 year cicadas seem to have a whooping noise as well. From a distance it sounds like some kind of machine, up close it is as loud as a concert with a sort of white noise ringing in your ear. Quite a few kept landing on me, the trick is to not let them sit on you too long otherwise they will try and stick you with a sap sucking mouth part. For the most part they are harmless and will just blunder around bumping into you as they try and find a spot on the tree.