Louis-Joseph Diémer (14 February 1843 – 21 December 1919) was a French pianist and composer. He was the founder of the Société des Instruments Anciens in the 1890s, and gave recitals on the harpsichord. His output as a composer was extensive, including a piano concerto and a quantity of salon pieces, all more or less forgotten these days.
Diémer was born and died in Paris. He studied at the Paris Conservatoire, winning premiers prix in piano, harmony and accompaniment, counterpoint and fugue, and solfège, and a second prix in organ. His teachers were Antoine Marmontel for piano, Ambroise Thomas for composition and François Benoist for organ.
He quickly built a reputation as a virtuoso and toured with the violinist Pablo de Sarasate. At the Conservatoire he taught, among others, Édouard Risler, Alfred Cortot, Lazare Lévy, Alfredo Casella, Yves Nat, Marcel Ciampi, José Cubiles and Robert Casadesus.
In 1888, Diémer succeeded Marmontel as professor of piano at the Paris Conservatory. He was also instrumental in promoting the use of historical instruments, giving a series of harpsichord performances as part of the 1889 Universal Exhibition and contributing to the founding of the Société des Instruments Anciens.
Works dedicated to Diémer
César Franck composed his Symphonic Variations for him, Jules Massenet dedicated his only piano concerto to him, and Édouard Lalo dedicated his Piano Concerto in F minor to him. Pyotr Ilyich Tchaikovsky's 3rd Piano Concerto was intended to be dedicated to Diémer.
Diémer was also among the earliest pianists to record for the gramophone. His recordings are said to show the best aspects of the 19th-century French piano school—clarity, point, and control in rapid, detaché passages and limpid pianissimo scales. They clearly attest to Diémer's title in the French press as "the king of the scale and the trill. They also give evidence to comments made by his pupil Lazare Lévy, who himself would become an influence on the French musical scene. Lévy wrote, "The astonishing precision of [Diémer's] playing, his legendary trills, the sobriety of his style, made him the excellent pianist we all admired".
- Schonberg 1987, 287.
- Schonberg, Harold C. (1987) , The Great Pianists (Rev Upd ed.), New York: Simon & Schuster, ISBN 978-0671638375
- The French School: Louis Diémer and his Pupils. Retrieved 31 Jul 2013.
- Louis Diémer and the 1769 Taskin harpsichord
- "Diemer, Louis". Encyclopedia Americana. 1920.