The author's discussion and notes make an important distinction: a pleasing voice is not identical with correct tajwīd. A melodious recitation cannot make an altered letter or vowel accurate.
A learner with a plain voice may nevertheless establish the more important foundation of correct consonants and vowels. Prioritize accurate pronunciation, then work on fluency and vocal beauty without compromising the rules.
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Beauty of voice versus correct pronunciation
Why Tajwīd Matters: Foundations and Terminology
The author's discussion and notes make an important distinction: a pleasing voice is not identical with correct tajwīd. A melodious recitation cannot make an altered letter or vowel accurate.
A learner with a plain voice may nevertheless establish the more important foundation of correct consonants and vowels. Prioritize accurate pronunciation, then work on fluency and vocal beauty without compromising the rules.