What is the origin of the idiom "life is a bowl of cherries" and when to use it?

The phrase "life is a bowl of cherries" originated in the early 20th century, particularly in the United States. It gained popularity in the 1930s through a song titled "Life Is Just a Bowl of Cherries" written by Lew Brown and Ray Henderson. It is commonly used in casual conversations and informal writing to remind oneself or others to appreciate life's pleasures and maintain a positive attitude.