The Ruling On Reciting The Qur’ān In Unison - Shaykh ‘Abdul-‘Azīz b. Bāz
It was not from his Sunnah (Tradition), nor from the Sunnah of his companions and their way to recite the Qur'ān together in unison. This was not from their Sunnah (Tradition).
The Ruling on Gathering To Send Ṣalawāt on The Messenger With Raised Voices
This is an innovation. And what is legislated for the Muslims is to send Ṣalawāt (salutations) upon the Prophet (may Allāh praise him and mention his high status to the angels) without raising the voice loudly in a strange and displeasing manner, and without it being in unison.
Manners of The Student of Knowledge - Shaykh Ibn Bãz
Shaykh ʿAbdul-ʿAzîz Ibn Bâz [رحمه الله] was asked: What are the manners that a student of knowledge should possess?