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.
In A Nutshell.  Song of Myself  might be the most egotistical poem ever written: it's all about me, myself, and I. In the first line, American poet Walt Whitman kindly informs us that he is going to celebrate himself, and throughout 52 glorious sections, he does just that. never read his book, but was told it was disgraceful.. When Whitman became more famous later in his career, he edited out some of the juiciest bits of Song of Myself, which is why many readers, including Shmoop, prefer the first edition.