So I suppose this is where I give you a disclaimer. I am not Islamic but have been fascinated with the call to prayer since I was a small child and woke up to the chanting each day for four years when I was living in Iran. Even visiting Islamic countries today it is still somewhat comforting and I really have no idea what is being said.
That being said when we tell our students that there is a call to prayer five times daily it is a little hard to really understand until you listen to the chanting in the video above.
When my family and I visited Istanbul last summer we stayed a block from the Hagia Sophia and got to hear three competing prayers at once from "overlapping" mosques as you can hear in the video below.