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We start with the number, 3. Schubert wrote his last 3 Sonatas as a Triptych. Before that, Beethoven and his last 3 sonatas. Before that, Mozart and his last 3 symphonies. Before this, J.S. Bach and his Prelude and Fugue in Eb major (Saint Anne) in Eb major, which has 3 flats, and which has a triple fugue, each subject representing one person of the Holy Trinity, and so on.
The number 3 has always been very important. In religious matters, we think of the Holy Trinity. In literature, we have in story books: "there were three kids", or "three boys", and so on. In Saint Paul's letter to the Corinthians, we have a trinity: faith, hope, and love. Three fundamental truths of absolute good.
The number "3" is a number of perfection, a number of completion, and a number of a full "coming around", if you will. Beethoven's last sonata in C minor, with 3 flats, demonstrates this perfectly. Now we come to the last, and perhaps, the greatest sonata of Herr Schubert. This monument, the Sonata in Bb Major, is in my opinion the greatest keyboard work he ever wrote.
The number 3 is pervasive in this work. The opening chords in the right hand, which portray a sense of absolute stillness and calmness, are voiced in 3 voices. In measure 19, he modulates suddenly down by a major 3rd, from Bb to Gb. In measure 48 he modulates to F# minor, which has 3 sharps. From here he moves to A major, which also has 3 sharps. After the first repeat happens, and we arrive at the second, we modulate up by a minor third to the enharmonic minor, (Db minor), written as C# minor, which is a minor third up from Bb. This is no coincidence, by the way. He's already foreshadowing the second movement. From here we move to a windy theme (m131), in A major, which again, has 3 sharps, and a flowing right hand in triplets (3 again). We modulate from A up a major third to the enharmonic of C# major, which is now written as Db major. And on, and on, and on this goes. This work, the sonata as a whole, is tied together by two main germ motives: the interval of a 3rd, and the eerie and doom-ridden interval of a minor 2nd, which pervades the trills in the first movement. The f to the Gb and back down, and so on. This interval is put to use compositionally in the 4th movement to create a great sense of unrest and struggle.
The vast and wonderfully expansive theme is derived from two pieces: Schubert's Lieder: "Am Meer", and the Archduke Trio of Beethoven op. 97. Schubert's Lieder are omnipresent, and they determine much of the interpretation, tempo, and other aspects of his works. For this work, the clear and obvious recomposition of the melodic elements from Am Meer gives us a very good basis from which to start interpretationally.
Continued in comments...
Recording information:
Artist: Matthew Cates
Piano: 1840 Conrad Graf Fortepiano, A=432Hz, Well Tempered Tuning
Microphones: DPA4015 Wide Cardoid Mic (x2)