"Stop" is a song from the 1979 Pink Floyd album, The Wall. It was written by Roger Waters.
Pink is tired of his life as a fascist dictator and the hallucination ends. He is also tired of 'The Wall', accordingly he devolves into his own mind and puts himself on trial. The song is also about his realisation that everything that led up to his 'wall' may have been his own fault, hence the line "Have I been guilty all this time".
At only 30 seconds long, it is the shortest Pink Floyd song.
