You might have seen piano jazz giants laying sheet music on the piano without using music rest while playing with other musicians.
Intuitively it seems easier to read sheet music and play using music rest.
Why did piano jazz giants play without music rest when accompanied by other musicians? There is a reason.
Interactive nature of jazz makes eye contact essential. Music rest obstructs the view of accompanying musicians, and makes interactions more arduous. Therefore, many piano jazz giants prefer not to use music rest when playing with other musicians.
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Classic Jazz Giants 