It provides bi-directional flow of information between a commanding officer and subordinate military units. A staff also provides an executive function where it filters information needed by the commander or shunts unnecessary information.
AINâT SHE SWEET by Jack Yellen & Milton Ager. According to Wikipedia we find that âAinât She Sweetâ is a song composed by Milton Ager (music) and Jack Yellen (lyrics) and published in 1927 by Edwin H. Morris & Co., Inc./Warner Bros., Inc. It became popular in the first half of the 20th century, one of the hit songs that typified the Roaring Twenties.
There is a 1963 hit song called Sweet Dreams, sung by Patsy Cline, in addition to the Annie Lennox and BeyoncÃ© songs mentioned in other answers. (Quora wants to collapse my answer for some reason. Although it is brief, it also happens to be a true statement.