Stephanie Yang | Los Angeles Times (TNS)

KAILUA, Hawaii — Quincy Cortez plucks at a slim black box laid across his legs, his fingers flashing silver.

Steel strings twang with each pull from the metal rings — wearable guitar picks — adorning his right thumb, index and middle finger. His left hand hovers over the strings along the neck, a cylindrical tube held between his thumb and middle finger drawing the metallic tones into a smooth glissando when it touches steel.

A few minutes into the leisurely melody, the 16-year-old hesitates.

Next to him, 67-year-old teacher and

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