Shama-il Tirmidhi Chapter 043, Hadith Number 002 (298).

Qataadah Radiyallahu'Anhu reports: "I inquired from Anas Radiyallahu 'Anhu: 'How was the recital of Rasulullah Sallallahu 'Alayhi Wasallam ?' He replied: 'He recited (The words of madd) with a madd'".

Commentary
The words that are to be recited with madd were recited with a madd (long intonation). This can only be done if one recites steadily, and with care. It is difficult to pronounce the madd if one recites hastily. From this, both things are apparent. One should recite steadily, and recite the madds, where they appear. The commentators of hadith have written that there are laws governing the recital of the rnadd. These are described fully in the books of tajweed. It is necessary to implement them. In our times the Qurraa (Qaaris) stretch the madd so much, overdoing it. Only the things that are done according to its laws and fundamentals are correct. Excess or deficiency are both abhorred.