The subject of the vow is the correct recitation in the normal way based on the information the person possesses. If he realized that there was a mistake, then he should correct it. If he realizes that he made a mistake after some time has passed or after he has completed the recitation of the Quran, then it is not obligated to repeat the recitation correctly, although it is better to repeat those verses that were read incorrectly.
If the music causes ‘tarab’ then it is not permissible to listen to it. ‘Tarab’ means the psychological interaction with the music or singing, whether it leads to joy, sadness, pride or any other emotion.
If the two parties agreed on forming a marriage contract between them in such a way that the paid money is considered as dower like the permanent marriage, then the marriage is valid. If she understands that the relationship allows her to have sexual acts in return for a fee, then it is adultery. The same can be said if she understands the relationship as a form of friendship.