The Great American Songbook refers to a collection of the most important and influential American popular songs and jazz standards from the early 20th century. This repertoire includes works by notable composers and lyricists such as George Gershwin, Irving Berlin, and Cole Porter. These songs often reflect themes of love, loss, and the American experience, and they have been performed by countless artists across various genres. Many of the songs in the Great American Songbook have become timeless classics, frequently covered by musicians in jazz, pop, and musical theater. Iconic pieces like "Summertime," "As Time Goes By," and "My Funny Valentine" continue to resonate with audiences today, showcasing the enduring legacy of this rich musical tradition.