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Tarji' in recitation is a permissible type of reciting the Qur'an in a melodious voice, as the Prophet said: "Whoever does not recite Qur'an in a nice voice is not from us," and tarji' was mentioned in Saheeh al Bukhari, : "Mu'awiya bin Qurra reported that `Abdullah bin Al-Maghaffal Al-Muzani said, "I saw Allah's Apostle on the day of the Conquest of Mecca, riding his she-camel and reciting Surat-al-Fath (48) or part of Surat-al-Fath. He recited it in a vibrating and pleasant voice. Then Mu'awiya recited as `Abdullah bin Mughaffal had done and said, "Were I not afraid that the people would crowd around me, I would surely recite in a vibrating pleasant voice as Ibn Mughaffal did, imitating the Prophet." I asked Muawiya, "How did he recite in that tone?" He said thrice, "A, A , A." .
What is meant is that we give a good voice to the Qur'an, to make it good and beautiful and interesting and so on, without turning it into a song.
This should be helpful in understanding the verses and being influenced by them, rather than focusing the listener's attention on the melody and vocal performance to the point of neglecting the meanings. Also, the reader must adhere to the rules of tajweed and correct recitation. Imam al-Qurtubi said, warning from tarji' that leads to neglecting the rulings of recitation:
"Besides, while reciting the Quran, there is tatrib in random lengthening and shortening, tarji' in making the voice wave, adding hamza where there is no hamza and lengthening a vowel where there is no lengthening. Thus, one "alif" becomes a few "alifs" and one "waw" becomes a few "waws". This causes addition to the Quran, which is haram".(Tafseer al Qurtubi I/16.)