William Blake 
Songs of Innocence and Songs of Experience 

Piping down the valleys wild, Piping songs of pleasant glee, On a cloud I saw a child, And he laughing said to me: ‘Pipe a song about a Lamb!’ So I piped with merry cheer. ‘Piper, pipe that song again.’ So I piped: he wept to hear. ‘Drop thy pipe, thy happy pipe; Sing thy songs of happy cheer!’ So I sung the same again, While he wept with joy to hear.