وَيُكْرَهُ التَّلْحِينُ فِي الْأَذَانِ وَالْإِقَامَةِ
Musical distortion or excessive stretching that changes letters, vowels or meaning is disliked. Beautifying the voice without corrupting the words is a different matter. The legal concern is preserving the wording, not banning every pleasant voice.
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The Mu'adhin: Preferred Qualities and Disliked States
وَيُكْرَهُ التَّلْحِينُ فِي الْأَذَانِ وَالْإِقَامَةِ
Musical distortion or excessive stretching that changes letters, vowels or meaning is disliked. Beautifying the voice without corrupting the words is a different matter. The legal concern is preserving the wording, not banning every pleasant voice.