Adjusting the truss rod affects the intonation of a guitar as well as the height of the strings from the fingerboard, called the action. Some truss rod systems, called double action truss systems, tighten both ways, pushing the neck both forward and backward (standard truss rods can only release to a point beyond which the neck is no longer compressed and pulled backward). The artist and luthier Irving Sloane pointed out, in his book Steel-String Guitar Construction, that truss rods are intended primarily to remedy concave bowing of the neck, but cannot correct a neck with "back bow" or one that has become twisted.[page needed] Classical guitars do not require truss rods, as their nylon strings exert a lower tensile force with lesser potential to cause structural problems. However, their necks are often reinforced with a strip of harder wood, such as an ebony strip that runs down the back of a cedar neck. There is no tension adjustment on this form of reinforcement.
The nut is a small strip of bone, plastic, brass, corian, graphite, stainless steel, or other medium-hard material, at the joint where the headstock meets the fretboard. Its grooves guide the strings onto the fretboard, giving consistent lateral string placement. It is one of the endpoints of the strings' vibrating length. It must be accurately cut, or it can contribute to tuning problems due to string slippage or string buzz. To reduce string friction in the nut, which can adversely affect tuning stability, some guitarists fit a roller nut. Some instruments use a zero fret just in front of the nut. In this case the nut is used only for lateral alignment of the strings, the string height and length being dictated by the zero fret.
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With that being said, nickel strings definitely have a richer tone with more body than steel strings. This warmth is especially pleasing when used to play older genres of music, blues in particular. The strings are also a great fit for rhythm work, because the warmth inherent to these strings helps to increase the overall body and richness of a mix.

As a general rule, brass strings are always going to be brighter than bronze strings. Though, counterintuitively, many brass strings go by the moniker of “80/20” bronze. These strings are actually the one in the same. Brass, or 80/20 bronze as it’s often known, is made from 80% copper and 20% zinc. This gives the strings a bright and cutting voice, though when used on guitars that already have a prominent high-end response it can make an instrument sound thin and tinny. For best results, use brass strings on a guitar that’s an OM size or larger (so this would include OM guitars, dreadnoughts, and jumbos).

The hardest thing about playing chords when you get started is changing between them. To effectively change between chords, you need to be economical with your movements. Spend a bit of time thinking about where your fingers need to be for each chord, and work out the most efficient way to move from one to the other. For example, from a C major, you can flatten your index finger so it covers the first string too and move your middle and ring fingers both down a string to switch to an F. Easy changes to start with are between C major and A minor and G major and E minor.
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