Every time I play the electric guitar, I wonder: why does my guitar sound out of tune the moment I play a note, even when I've tuned it perfectly with a tuner? The most counter-intuitive thing about the guitar is that the pitch changes the instant you strike the string. Why? Because when you pluck, your pick or finger inevitably pulls the string taut. At that initial moment, the pitch is slightly sharp before it gradually settles. This is why even a perfectly tuned guitar can sound 'off' or clash in chords, especially when recording. My professor always says that guitar intonation 'sucks' because the strings are subjected to violent tension changes during picking. Since frequency is proportional to the square root of tension, the harder you pluck, the sharper the pitch becomes. For heavy-handed players who use aggressive strumming or slapping techniques, the attack can be more than ten cents sharp, which is massive. Engineers often tell guitarists in the studio to play with a lighter touch because hitting too hard pulls the pitch out of alignment. Beginners often think playing with more 'passion' is better, but it actually ruins the tuning of the entire chord. Similarly, pressing down on the frets also stretches the string and increases tension, making it inherently sharper. If you are nervous and press too hard, an experienced teacher can hear the pitch shift without even looking at your hands. This is precisely why high-end guitars are expensive—a significant portion of the cost goes into engineering that minimizes these tuning instabilities.
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