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"Guitar picks come in varying thicknesses to accommodate the different playing styles and kinds of strings. Thinner plectra are more flexible and tend to offer a wider range of sounds, from soft to loud, and produce a "click" that emphasizes the attack of the picking. However, some argue that heavier picks produce a brighter tone.
In rock and heavy metal, while playing electric guitar with hi-gain amplification or distortion, it is generally assumed that thinner picks produce muddier, heavier, less controllable sound and thicker picks produce more delicate, more controlled and well-shaped tone. Thinner picks also tend to rip or tear more often if used too forcefully, whereas a thicker one is more likely to wear down over time. Thicker picks are generally used in more discrete genres, such as heavy metal or power metal. However, there are many exceptions to these stereotypes, especially as there is an element of guitarist preference involved in selecting pick thickness.
Many death metal musicians swear by picks thicker than 1.5mm, because it allows more control over heavy gauge strings. Thinner picks tend to give less attack and do not give as much control when doing fast tremolo picking. Also, they tend to wear much faster when used with heavier gauge strings.
Jazz guitar players tend to use quite heavy picks, as they also tend to favor heavy gauge flat-wound strings. Bass players tend to prefer thick picks because their strings are far thicker than those of guitarists."
Asta spune Wikipedia.