"Fantasia (Daydream)" is a classical music composition by George Gershwin, blending elements of jazz and orchestral music. It was originally written for piano and later arranged for orchestra, showcasing Gershwin's unique style that combines popular and classical influences. The piece is characterized by its lyrical melodies and rhythmic vitality, evoking a sense of nostalgia and imagination. The composition is often associated with the concept of daydreaming, where the listener is invited to escape reality and explore their thoughts and fantasies. Its rich harmonies and expressive themes create a dreamlike atmosphere, making it a favorite in both concert halls and popular culture.