A musical instrument of the chordophone family, the lyre-guitar was a type of guitar shaped like a lyre. It had six single courses and was tuned like the modern classical guitar, with a fretboard located between two curved arms recalling the shape of the ancient Greek lyre.
The lyre-guitar nearly always had a built-in pedestal allowing it to stand upright when not in use.
Claimed to have been invented in 1780 by Pierre Charles Mareschal, a prominent French luthier, who accused the French musician Phillis Pleyel of stealing his design for what he called the Lira Anacreòntica  The lyre-guitar enjoyed great popularity as a salon instrument especially in Paris between 1780 and 1820. It became very much in vogue and pervaded the highest levels of society; Marie Antoinette played one and the great guitarists of the day such as Ferdinando Carulli, Fernando Sor, Matteo Carcassi, Mauro Giuliani and Pierre Jean Porro wrote music and methods for it.
Its decline coincided with the waning of the popularity of the guitar as a salon instrument, increasingly supplanted by the piano which benefitted from ongoing improvements to its keyboard action. The lyre-guitar nevertheless persisted, not so much as a musical instrument, but more commonly as a symbol of classicist ideals appearing in numerous allegorical paintings (e.g. Mähler's portrait of Beethoven), and later on, photographs as a prop for evoking ancient Greek and Roman themes.
"The idea was to create an instrument which looked pretty and provided a visual accessory to help ladies of fashion to assume the gracious pose of Greek “kithara” players. This visual likeness became a potent ingredient of the culture of the upper classes.",
Although the lyre-guitar is rarely heard or recorded it is not extinct. A body of nearly forgotten repertoire exists often by highly notable guitarists of the golden age of the guitar. Today lyre-guitars can be made to order by luthiers and authentic examples exist in museums and private collections.
- "Plagiat dénoncé aux musiciens et aux amateurs des lyres nouvelles, inventées par Mareschal, Luthier à Paris", 1780, by P. C. Mareschal.
- " La lyre-guitare" in "Les Cahiers de la Guitare", 1988, by D. Ribouillault.
- Matanya Ophee, "The Story of the Lyre-Guitar", in Soundboard XIV/4, 1987-1988 Winter
- The Steve Howe Guitar Collection (Balfon Books UK) - (ISBN 1-871547-64-4) - (First British Edition 1994) - p51. Image of Roudhloff Lyre Guitar c.1815. The lyre guitar is marked with "Roudhloff the elder son" who is known to have opened a workshop in Fitzroy Square, London in the early 1900s.
- Lyre-guitar. Étoile charmante, between the 18th and 19th century by Eleonora Vulpiani
- Matanya, Ophee (1987–1988), "The Story of the Lyre-Guitar", Soundboard, XIV/4 ( Winter)
- The New Grove Dictionary of Music and Musicians. 1980. ISBN 0-333-23111-2.
- Bonner, Stephen (1972), The classic image: European history and manufacture of the lyre guitar, 850-1840, Bois de Boulogne: Harlow, ISBN 0-900998-09-1
- "ivre-Guitarre" Einige Worte über die neue französische Lyra (Lyre-Guitarre.) AMZ, August 1801 (includes an image on page 789)
- "lyre+guitarre" General music teacher: adapted to self-instruction...embracing also an extensive dictionary of musical terms by Gottfried Weber; Publisher: J.H. Wilkins, & R.B. Carter, 1842
- "lyre+guitarre" Adams' new musical dictionary by John Stowell Adams; Publisher: S.T. Gordon & Son, 1865
- Cité de la musique, Paris (search-phrase: Mot-clé(s) : lyre guitare)
- Museum of Fine Arts, Boston
- National Music Museum, The University of South Dakota
- The Metropolitan Museum of Art, New York, New York
- Museum für Musikinstrumente der Universität Leipzig (click on Lyragitarren)
- Ringve Museum, Trondheim (in Norwegian)
- Museo Civico d'Arte di Modena (shows a lyre guitar by Gennaro Fabricatore)