Tajwīd (Arabic: تجويد taǧwīd) is an Arabic word for elocution, meaning proper pronunciation during recitation, as well as recitation at a moderate speed. It is a set of rules which govern how the Qur'an should be read.
Here is a man I found on Hamra street with an incredible voice. He sits there, on the sidewalk and recites the Qur'an. He says it is to spread spirituality, peace and Islam to the pedestrians on Hamra street.