Flatwound strings have a flat surface. These strings are very popular among jazz guitarists because they have a very dark and understated tone. However, they are also more difficult to play. These strings are not a good fit for rock or blues, because they’re stiffness and dark tone means that it’s hard to cut through the mix and pull off the fast and intricate runs and bends that define blues, rock, and metal.
The standard guitar has six strings, but four-, seven-, eight-, nine-, ten-, eleven-, twelve-, thirteen- and eighteen-string guitars are also available. Classical and flamenco guitars historically used gut strings, but these have been superseded by polymer materials, such as nylon and fluorocarbon. Modern guitar strings are constructed from metal, polymers, or animal or plant product materials. Instruments utilizing "steel" strings may have strings made from alloys incorporating steel, nickel or phosphor bronze. Bass strings for both instruments are wound rather than monofilament.

The twelve-string guitar usually has steel strings, and it is widely used in folk music, blues, and rock and roll. Rather than having only six strings, the 12-string guitar has six courses made up of two strings each, like a mandolin or lute. The highest two courses are tuned in unison, while the others are tuned in octaves. The 12-string guitar is also made in electric forms. The chime-like sound of the 12-string electric guitar was the basis of jangle pop.
Electric guitars, introduced in the 1930s, use an amplifier and a loudspeaker that both makes the sound of the instrument loud enough for the performers and audience to hear, and, given that it produces an electric signal when played, that can electronically manipulate and shape the tone using an equalizer (e.g., bass and treble tone controls) and a huge variety of electronic effects units, the most commonly used ones being distortion (or "overdrive") and reverb. Early amplified guitars employed a hollow body, but a solid wood body was eventually found more suitable during the 1960s and 1970s, as it was less prone to unwanted acoustic feedback "howls". As with acoustic guitars, there are a number of types of electric guitars, including hollowbody guitars, archtop guitars (used in jazz guitar, blues and rockabilly) and solid-body guitars, which are widely used in rock music.
A "guitar pick" or "plectrum" is a small piece of hard material generally held between the thumb and first finger of the picking hand and is used to "pick" the strings. Though most classical players pick with a combination of fingernails and fleshy fingertips, the pick is most often used for electric and steel-string acoustic guitars. Though today they are mainly plastic, variations do exist, such as bone, wood, steel or tortoise shell. Tortoise shell was the most commonly used material in the early days of pick-making, but as tortoises and turtles became endangered, the practice of using their shells for picks or anything else was banned. Tortoise-shell picks made before the ban are often coveted for a supposedly superior tone and ease of use, and their scarcity has made them valuable.
On guitars that have them, these components and the wires that connect them allow the player to control some aspects of the sound like volume or tone using knobs, switches, or buttons. The most basic electronic control is a volume knob. Some guitars also have a tone-control knob, and some guitars with multiple pickups have pickup selector switches or knobs to determine which pickup(s) are activated. At their simplest, these consist of passive components, such as potentiometers and capacitors, but may also include specialized integrated circuits or other active components requiring batteries for power, for preamplification and signal processing, or even for electronic tuning. In many cases, the electronics have some sort of shielding to prevent pickup of external interference and noise.
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If you're a fan of the Grateful Dead, check out the D'Angelico Premier Series DC Grateful Dead Semi-Hollow Electric Guitar. In the acoustic department, the Alvarez Artist Series AD60 dreadnought acoustic guitar comes highly rated, thanks to its hand-selected spruce top, mahogany back and sides, and powerful tone. Singer-songwriters and fans of acoustic-driven music must check out the latest Ed Sheeran Martin guitar, the comfortable, easy-to-play Divide Signature Edition Little Martin acoustic-electric. 

At MI, you learn from a proven curriculum taught by the best guitar instructors in the world, augmented by visiting artists’ seminars, concerts, and lessons from some of the greatest players in contemporary music. At our guitar music college, you get to network with other players, find your creative voice, and get the training you need to become the player you have always dreamed of being.