During the latter part of the Classic Period, Ludwig van Beethoven wrote his Piano Sonata in G Major, Op. 14, No. 2, I. It appears as though the composer is merely following the guidelines of a traditional sonata-form movement, creating a remarkable “illusion of simplicity” appropriate for the time. Upon further investigation, however, Beethoven has created a highly complex plan of musical action through his use of key schemes that allows for smooth transitions from theme to theme and from section to section throughout the movement.
Valliere, Kara F. '14, "Beethoven's Thematic Processes in the Piano Sonata in G Major, Op. 14: "An Illusion of Simplicity"" (2012). Music Department Student Scholarship. Paper 1.