The Piano Sonata No. 19 in G minor, Op. 49, No. 1, and Piano Sonata No. 20 in G major, Op. 49, No. 2, are short sonatas by Ludwig van Beethoven, published in 1805. Both works are approximately eight minutes in length, and are split into two movements. These sonatas are referred to as the Leichte Sonaten to be given to his friends and students. The Piano Sonata No. 20 was possibly written around the time Beethoven composed the Third and Fourth sonatas, but because it was published in Vienna in 1805, nearly a decade after it was actually written, it was assigned then-current opus and sonata numbers, which classified it alongside works from the composer's middle period. Very similar circumstances caused Beethoven's Piano Concerto No. 2 to appear as his second, even though it predated the first. Beethoven often suppressed works in his early years, either revising them later for publication or determining that they were not fit. In fact, he withheld many early works from publication for life. In the case of these two sonatas, it was Kaspar van Beethoven, the composer's brother, who decided they were worthy of publication. Against the composer's will, he presented them to a publishing house, thus allowing posterity to hear works that might otherwise have been lost or destroyed.
, while noting the sonata's lack of technical challenges, states that it is a "deeply affecting and distinguished work".
Movements
First movement
The first movement is written in standard sonata-allegro form. After the first and second theme, it moves into the recapitulation with very little development. After restating the theme in the bass with new counterpoint in the treble, the work closes with a brief coda, ending with a Picardy third.
This sonata is a relatively simple work, featuring less sophistication than most of the other piano sonatas. Strangely, there are no dynamic indications in the autograph or first edition. It is considered the easier of the two "easy sonatas", and is also considered the easiest of all the Beethoven piano sonatas.
The first movement features a stately theme. It, and a more playful and lively second theme undergo only minimal development before recapitulating at the end, making for a simplified sonata form, with its main theme based heavily on a G major triad.
Second movement
The second movement of the Piano Sonata No. 20 shares a melodic theme with the Minuet of the Op. 20 Septet. Because the Septet was the later piece, Beethoven's suppression of the sonata and reuse of one of its themes suggests that he perhaps planned to scrap the piano work altogether. But the composer was known to recycle melodies, in some instances several times. This movement is cast in the form of a rondo, with the main rondo theme being, essentially, a minuet; the minuet features a charming melody that, along with its accompanying material, is repeated several times, varying somewhat in appearance, but remaining simple and unsophisticated.
