There are four patterns here: the thick low-note strings on top, the thin high-note strings on the bottom, the metal plating/bolts that hold the strings, and two of the many felt ribbons that dampen the vibrations on the strings.
Picture is taken from inside a grand piano. I didn't want to use any flashes since it made the lighting look flat, so I just went with a high ISO, low fstop, long shutter speed, and set up some regular living room lamps that gave "warm" light around the piano and golden look on the strings. I also wanted selective depth of field so that was the other reason for the low fstop.
I couldn't think of much PP that I should do with this pic so I just did: crop, resize, save.
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