Classical guitar for repertoire of all periods is sometimes critically viewed: Torres and post-Torres style modern guitars (with their fan-bracing and design) have a thick and strong tone, very suitable for modern-era repertoire. However, they are considered to emphasize the fundamental too heavily (at the expense of overtone partials) for earlier repertoire (Classical/Romantic: Carulli, Sor, Giuliani, Mertz, ...; Baroque: de Visee, ...; etc.). "Andrés Segovia presented the Spanish guitar as a versatile model for all playing styles" to the extent, that still today, "many guitarists have tunnel-vision of the world of the guitar, coming from the modern Segovia tradition". While fan-braced modern
Brahms guitar Brahms guitar Commonly referred to as the cello-guitar, the Brahms guitar was invented in 1994 by classical guitarist Paul Galbraith in collaboration with the luthier David Rubio. It was originally conceived in order to perform Johannes Brahms' Theme and Variations Opus 21a. David Rubio's protégé, luthier Martin Woodhouse, has innovated the design and continues to build Brahms guitars. The instrument is an eight-string guitar, adding both a high and a low string to the conventional six string guitar. The tuning adds a low A (a fifth below the standard low E, and a high A (a fourth above the standard