The usual Old English word for cloud was weolcan. In Middle English, skie also originally meant cloud. The four fundamental types of cloud classification (cirrus, cumulus, stratus, nimbus) were proposed by British amateur meteorologist Luke Howard (1772-1864) in 1802. Figuratively, as something that casts a shadow, from early 15c.; hence under a cloud (c.1500).
Thanks for the A2A. Okay, the most famous song in the world is no doubt 'Happy Birthday', followed by various Christmas carols (since the majority of human population is Christian indeed and since Santa is a really famous guy), folk songs, army marches and national anthems.
ChÃ´ro No. 1 - Heitor Villa-Lobos. Villa-Lobos is one of the most important composers for classical guitar. His music seamlessly combines Brazillian folk music with contempory classical music. ChÃ´ro No. 1, one of his most famous pieces, is a perfect merging these two styles. Get the recording.