Al-jawab billahi at-taufeeq (the answer with Allah's guidance)
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2) According to Imam Abu Hanifah and Imam Shafi' (Rahmatullahi Alaihima), if the chest is shifted away from the Qiblah without any reason then Salah will be invalid.
According to Imam Malik (Rahmatullahi Alaih), if the feet are away from the direction of the Qiblah, the Salah will be invalid.
According to Imam Ahmad (Rahmatullahi Alaih), if the Musalli entirely turns away from the Qiblah, his Salah is invalid.
(Al Fiqhul Islami Wa Adillatuhu Vol.2 Pg.17)
3) It is forbidden to listen to Nasheeds which includes musical sound.
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And Only Allah Ta'ala Knows Best.