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
Classical guitar technique thumb, allowing the left hand to shift without sticking to the guitar. By keeping the thumb behind the second finger and playing off the front of the third finger, the classical guitarist sets the left hand shape. Playing with the left hand more or less parallel to the neck requires a certain amount of stretching between the fingers. There is a tendency, especially when one first begins guitar, to collapse the first and second fingers together to press on the string. For example, in playing the F on the first string, first fret (often the second note ever fingered after