20th SONATA, Opus 49. No. 2, in G major. _Allegro ma non troppo--Minuet and Trio._ This Sonata contains little of interest, both the Allegro and the Minuet are in the olden style. 21st SONATA, Opus 53, in C major. _Allegro con brio--Introduzione--Rondo._ This fine Sonata, too often made a mere piece of virtuosity, was dedicated to Beethoven's early friend and patron, Count Waldstein. The form is remarkable. A first movement, full of light and colour, and the romantic _Molto Adagio_ forming an introduction to the final Rondo with its magnificent _Coda_. Beethoven originally intended the famous _Andante in F_ for the slow movement of this Sonata, but finally discarded it in favour of the present slow introduction. The second hymn-like subject of the first movement does not appear in the tonic key, either in the exposition or in the recapitulation, but only after the final development near the end of the piece. The simple subject of the Rondo was the result as shown of six separate attempts in Beethoven's note-books. The whole meaning of it is lost unless the low C of the left hand is taken into the phrase. It will then be seen to have a close connection with the opening figure of the introduction. The Rondo is often played too fast, the full effect of the _Coda_ is often lost by the preceding Rondo being taken too fast. The _glissando_ octave passage in it is very difficult on modern pianos on account of the deeper key fall. 22nd SONATA, Opus 54, in F major. This remarkable Sonata, which appeared for the first time in April, 1806, is in two movements only--a _Tempo d'un Menuetto_, in full binary form (more like a Sonata movement than a Minuet), and a _Allegretto con moto_ (somewhat Etude-like), with a _Prestissimo_ Coda in which the hands very easily get tied up. This Sonata is comparatively little known, doubtless on account of its over topping neighbours, the _Waldstein_ and the _Appassionata_. Bulow metronomed the opening movement at the quite moderate rate of 104 to the crotchet. The octave _bravura_ subject appears there in its full majesty. The _cadenza_ is noteworthy. 23rd SONATA, Opus 57, in F minor. (Labelled _Appassionata_ by the publisher Cranz). _Assai allegro--Andante con moto with variations--Allegro ma non troppo._