#import<FastLED.h>

#define NUM_COLS 20
#define NUM_ROWS 20
#define NUM_LEDS 256 

CRGB leds [256];

void setup()
{LEDS.addLeds<WS2812,3,GRB>(leds,256);}

void loop() {

byte x = beatsin8(10,0,20);
 leds[1] = CHSV (random8(),~0,~0);
  leds[4] = CHSV (random8(),~0,~0);
 leds[12] = CHSV (random8(),~0,~0);
 leds[33] = CHSV (random8(),~0,~0);


FastLED.show();
}