أرسل هذا في رسالة قصيرة: Unemployment rate predicts anger in popular music lyrics: evidence from top 10 songs in the United States and Germany from 1980 to 2017

 ______    _    _                ___     __   _   
|      \\ | || | ||     ___     / _ \\  | || | || 
|  --  // | || | ||    /   ||  | / \ || | '--' || 
|  --  \\ | \\_/ ||   | [] ||  | \_/ || | .--. || 
|______//  \____//     \__ ||   \___//  |_|| |_|| 
`------`    `---`       -|_||   `---`   `-`  `-`  
                         `-`