Pizzo Buzzer Random Loop Help!

Other Hardware Audio
4

``

/* Sweep
  by BARRAGAN <http://barraganstudio.com>
  This example code is in the public domain.

  modified 8 Nov 2013
  by Scott Fitzgerald
  http://www.arduino.cc/en/Tutorial/Sweep
*/

#include <Servo.h>

Servo servo1;// create servo object to control a servo
Servo servo2;
Servo servo3;
Servo servo4;
Servo servo5;
Servo servo6;
Servo servo7;
Servo servo8;

int pos = 0;// variable to store the servo position

void setup() {
  servo1.write(130);
  servo1.attach(0);
  servo2.write(40);
  servo2.attach(2);
  servo3.write(130);
  servo3.attach(3);
  servo4.write(40);
  servo4.attach(4);
  servo5.write(110);
  servo5.attach(5);
  servo6.write(40);
  servo6.attach(6);
  servo7.write(130);
  servo7.attach(7);
  servo8.write(30);
  servo8.attach(8);
  pinMode(10, OUTPUT);
  delay(2000);
}

void loop() {

  servo1.write(135);
  servo8.write(45);
  servo4.write(60);
  servo5.write(115);
  delay(15);

  tone(10, 243);

  for (pos = 0; pos <= 90; pos += 3.5) {
    servo2.write(pos);
    servo7.write(150 - pos);
    servo3.write(60 + pos);
    servo6.write(80 - pos);
    delay(10);
  }

  servo1.write(110);
  servo8.write(25);
  servo4.write(35);
  servo5.write(93);
  delay(15);

  tone(10, 4300);


  for (pos = 90; pos >= 0; pos -= 3.5) {
    servo2.write(pos);
    servo7.write(150 - pos);
    servo3.write(60 + pos);
    servo6.write(80 - pos);
    delay(10);

    tone(10, 5500);

  }
}

I want my quadruped to keep walking and playing random buzzer tones. In this version of my code, it just beeps at a constant rate. I want it to beep randomly and at random times, makes it sound less 'robotic' and more 'alive'