What is the ruling on working in the field of evaluating artificial intelligence responses or transcribing audio files, if some of them relate to permissible matters while others relate to matters that may be forbidden (such as songs or movies)?

Rating AI responses as good or bad is not haram, even if the subject matter is haram, because the rating pertains to the degree of correspondence between the answer and the question, not to the subject of the question itself. As for audio files, what is not permissible to listen to, it is not permissible to work on; due to the hadith: "The listener is a partner of the speaker," and due to the hadith: "O Allah, I seek refuge in You from the evil of my hearing"; for the evil of hearing is listening to what is not permissible to listen to.