Can you describe the sound a Zebra Finch makes?

The most common sound they make is a "beep-beep". Zebra finches remind me of little squeak toys. No two zebra finches sound exactly the same. They vary their beeps so you can identify them. When they are excited or , they start making a high-pitched buzzing sound. Zebra finches enjoy hearing cellphones, microwaves, and any other type of beeping noise. My zebra finches start singing when they hear these noises.