Amongst the good manners of reciting the Glorious Qur'an is to read it with a sweet voice and good tone. As the Glorious Qur'an is good in itself, reading it with a sweet voice maintains its beauty, attracts the hearts, and influences the feelings.
As-Suyuti (may Allah have mercy on him) said that reading the Qur'an with a sweet voice is recommended by the Sunnah, as the Prophet (peace be upon him) said,
"Adorn the Qur'an with your voices."
"Beautify the Qur'an with your voices since a sweet voice maintains the beauty of the Qur'an. "
"A sweet voice is the adornment of the Qur'an."
It is further recommended, according to An-Nawawi, to listen to and ask people with a sweet voice and good intonation to recite the Glorious Qur'an. People can gather to read the Qur'an and listen to each other.
 Reported by Ibn Hibban.
 Reported by Ad-Darami.
 Reported by Al-Bazzar.
 An-Nawawi. Al-Itqan, vol. I, pp. 302-303.