The Wall is less a collection of songs than a single work, which is sometimes frustrating; the plot lacks enough coherence to hold the snippets of music together. However, there are occasional flashes of brilliance on what ranks as Pink Floyd's most ambitious project. Most of these come from the fully developed songs, which have become classics in their own right. "Hey You," "Mother," and especially "Comfortably Numb" are subtle, incredible pieces of music. Though complex, they move at a relaxed pace, allowing the listener to absorb them slowly; this kind of pacing was something Pink Floyd excelled at. Also worth noting is the "Another Brick in the Wall/The Happiest Days of Our Lives" medley, which has become a staple of rock radio.