Liszt - Fantasy And Fugue On The Theme B-A-C-H For Organ S.260

The piano was central to the musical life of Franz Liszt. He was a virtuoso performer on the instrument from an early age, and his tours of Europe were legendary, and his compositions for piano and orchestra challenged the conservative nature that had crept into music in the middle 19th century. But despite his leadership with Wagner in what was called at the time "New Music", he had an interest in past composers and forms.  He championed works by composers that were unknown to the public at the time, such as the late music of Schubert and the opus 106 piano sonata "Hammerklavier" by Beethoven. He helped create pathways to new modes of expression by having one eye on the future and one on the past.

Although as a composer he is most well known for his music for solo piano and the symphonic poems for orchestra, he also composed in most other genres of music, including works for solo organ. The articleThe Organ Music Of Liszt by musicologist Zoltán Gárdonyi   states that Liszt traveled to Geneva Switzerland in 1836 and improvised on a church organ there.

As a trained pianist, Liszt was not adept at the pedals of the organ to begin with, and perhaps never got really proficient on them. But the manuals of course were a different story. He probably could adjust quite rapidly to the differences in the keyboards of pianos and organs. And there are many differences in the two instruments besides the pedals.

Liszt composed around 40 works for organ with the majority of them being transcriptions of other composer's music as well as his own. But he did compose two masterpieces of the literature for organ. The first was composed in 1850, the Fantasy and Fugue On The Chorale 'Ad nos, ad salutarem undam' from Giacomo Meyerbeer's opera The Prophet. This is a massive work that takes around thirty minutes to perform. The second of Liszt's masterpieces for solo organ was composed ion 1855, the  Fantasy And Fugue On The Theme B-A-C-H.

In the 1840's the Bach revival was in full swing with Felix Mendelssohn continuing to lead the way in exposing the music to audiences. Mendelssohn played some of Bach's organ works at a concert in 1840, and Liszt wrote transcriptions of selected organ works for piano. Liszt's homage to Bach's music is based on the spelling in German musical nomenclature:

Bach himself used this 'Bach motif'' in one of his fugues in his The Art Of Fugue, and there is a long list of composers past and present who have used it.

Liszt begins the work with the motif in a solo for pedals:

The first part of the work is a fantasy with wide ranging tonalities that leads into the fugue which begins in the pedals. The fugue works through a few entrances of  the subject and then becomes a more free working out of ideas and motives until the subject returns in a more agitated form.  A section of trills for the pedals leads back to a fragment of the subject. After a short section marked maestoso, the Bach motif is heard again  in octaves in the pedal with shifting harmonies in the keyboards. This seems to be leading up to a grand finish, but instead they lead into a few bars in a more hushed tone that add a sense of mystery. This spell is broken by the final bars in fortissimo that modulate to the end chord in B-flat major.