When I was in high school (or maybe early college, I don’t quite remember), I was thrilled to discover the Grand Duo Concertant sur des thèmes de Robert le diable by Chopin and Franchomme. At the time, I thought it was incredible that a giant like Chopin would collaborate with “my etude composer,” Franchomme. (How wrong I was: both were quite famous in their own right.) It seemed like a gift: another great Chopin work for the cello, in addition to the late Sonata and the early Polonaise Brillante.
Years later, I had the chance to perform the Grand Duo in a recital during my late 20s. My initial excitement waned as I studied and played the piece. While it had some lovely moments (the last page is genuinely satisfying), the work as a whole felt imbalanced. The piano often dominated with virtuosic solo lines, while the cello was left with long notes, brief etude-like sequences, or sat out. I ended up rewriting parts of the cello line to give it more substance (I’m not alone; Steven Honigberg and others have done the same).
That experience led me to look deeper into co-authored fantasies. It turns out that collaborations between pianists and violinists, as well as between pianists and cellists, were a common genre in the Romantic era. Many of these were opera fantasies, just like the Chopin-Franchomme Grand Duo. These collaborations often bore both names on the title page and were crafted for the public display of both partners’ talents. Some collaborations where the soloist/dedicatee is not credited include Dvořák’s Cello Concerto, where Wihan had significant input, or Tchaikovsky’s Rococo Variations with Fitzenhagen, and even the Pezzo Capriccioso, with Brandukov’s influence. (But that’s a topic for another article.)
In this article, I want to look specifically at the cello-piano collaborations between François Servais and Joseph Grégoir. Their output is vast: 22 numbered and one unnumbered duo, published between 1852 and 1869 (three years after Servais’s death). The final duo Servais co-authored that was published during his lifetime appears to be L’Africaine (No. 16), with six others being published posthumously. After Servais’s passing, his son Joseph took over the project (published in 1874 and later). So, any pieces labeled above No. 22 and attributed to François Servais are misprints.
The quality of the Servais-Grégoir duos varies greatly. Like the Chopin-Franchomme duo, most of them are heavily virtuosic for the piano. (I will publish a second installment in the coming weeks, overviewing each duo.) In fact, at least three are nearly identical to the violin-piano duos Grégoir co-wrote with violinist Hubert Léonard. Eleven titles overlap with the 23 duos with François Servais. In some cases, the two are virtually the same piece, transposed or slightly altered. The cello series often mirrors the violin series in both title and content.
For example, I listened to the recording of Der Freischütz (No. 11) while reading along with Léonard’s violin version. I found that about 80% of the content was identical to the Servais-Grégoir cello version. We observe the same thing with Don Juan [Giovanni] (No. 14). Tannhäuser (No. 13) is also very similar to the Léonard version, just in a different key. Grégoir likely reused his violin part, and Servais was content with what was already in place. Since Schott published all the music, copyright wasn't an issue.
But there are exceptions. Le Prophète (No. 3) exists in completely different versions between the cello and violin series. Some of the cello parts clearly show Servais’s touch, especially in works like Donizetti Duo (No. 1), Fra Diavolo (No. 2), Le Juif Errant (No. 5), L’Étoile du Nord (No. 6), Duo sur des Airs Espagnols (No. 17), La Preciosa (No. 18) and Huguenots (No. 19). Norma (No. 4), Martha (No. 7), Euryanthe (No. 15), and Casilda (unnumbered) show less technical involvement from Servais, but still some melodic charm. Duo sur des Airs Espagnols is more of a cello solo with piano accompaniment. It is based on "El Chacho Moreno" (Canción Andaluza) by José Melchor Gomis Colomer and the Jota Aragonesa. The melody of the slow part is the same as Sarasate's Malagueña, Op. 21, No. 1.
On the other hand, pieces like Tannhäuser (No. 10), Der Freischütz (No. 11), Lohengrin (No. 13), Don Juan [Giovanni] (No. 14), L'Africaine (No. 16), and La Traviata (No. 21) appear to feature minimal input from Servais; the cello writing doesn't reflect his usual style. The cello parts in the series continuation by Joseph Servais (No. 23 and later) are also among the easier ones.
In terms of being real duos (pieces where both instruments interact substantially), Nos. 1–6 are probably the strongest. Airs Espagnols (No. 17) is great if you want to play something in the typical Servais style with a simpler piano part. If you are looking for something pleasing with beautiful cello melodies and a pianist who’s willing to do most of the heavy lifting (a bit like Rachmaninov’s Cello Sonata), some of the others may still work nicely. Les Huguenots, La Preciosa, and some others have lengthy sections where the cello doubles the piano melody. The details of each duo will be covered in the next installment.
According to current research by Peter François, president of the Servais Society, we know that Servais himself performed Norma, Il Trovatore (No. 8), and Tannhäuser. It is possible he played others as well; future research may clarify this. To date, Der Freischütz, La Traviata, and Lohengrin have been recorded. Fra Diavolo and Tannhäuser have also been performed recently.
The genre of co-authored opera fantasies remains a fascinating niche of 19th-century music. These works reveal much about the collaborative process of the time and the practicalities of public concert life, where crowd-pleasing repertoire, publisher relationships, and performer identity all played a role in what got written and performed. While the Servais-Grégoir works don't reach the level of fame of their Chopin-Franchomme counterparts, they remain a rich area for exploration, performance, and reexamination.
In Part 2 of this article, I plan to examine each Duo more closely in terms of content and difficulty. Stay tuned!