Piano Sonata No. 3 (Beethoven)

The first movement follows the sonata allegro format of the classical period, and borrows thematically from Beethoven's Piano Quartet No. 3 in C major,[5] WoO 36, from a decade earlier. The movement opens with the main theme in the tonic key, beginning with a double-thirds trill-like pattern. This opening passage is infamous for pianists to play, and Arthur Rubinstein even used this passage to test pianos before performing on them. This pattern leads into an energetic outburst of a broken-chord and broken-octave section. The second theme of the exposition begins in the key of G minor, and is repeated in D minor at measure 33. It is not until measure 47 that the traditional dominant key is finally reached, where a subsidiary theme in the second thematic group appears, marked "dolce.[6]" A forte shows later, leading to a very rich melody with left and right hand. Then a similar outburst of a broken-chord and broken-octave sections appears in fortissimo. Then it ends with some difficult trills and an octave scale. Beethoven opens the development by improvising on trill patterns introduced in the end of the exposition, which are much more difficult to play. Following a broken-chords section filled with harmony changes, the main theme is restated in D major (pianissimo), the supertonic key of C major. Then a fortissimo and Beethoven's very common syncopations appears in the music giving a rhythm, this continues on to the resolution. The first movement is about 10 minutes long and is one of Beethoven's longest movements from his early period.

The second movement is marked Adagio and written in the key of E major. It is in rondo form, A–B–A–C–A–coda, written in the style of a string quartet, as there are four clear voices. The middle section, in E minor, contains numerous examples of Romanticism, and is considered a prelude to the master's later sonatas. Later in the movement, the E minor passage is repeated in E major.

The third movement, a scherzo, is written in minuet and trio form. It opens with a joke-like statement, and the composer uses some polyphony. The trio is in the relative minor key of C major (A minor) and contains running arpeggios in the right hand with the left hand playing a melodic line in octave form. The coda of this short movement ends the Scherzo softly with a tritone substitute authentic cadence.

The final movement, listed as a rondo, is in the sonata rondo form. The movement opens with an ascending run of first inversion chords in the right hand, which is the movement's main theme. Like the first movement, the second theme in the exposition is also written in G major. The great speed of this movement, combined with numerous examples of Beethoven's virtuoso skill such as the triple trill at the very end, makes it challenging for pianists.