I can understand the sentence from "しかも" onwards, but the former part is quite confusing to me. In particular:
- Who does "人" refer to?
- Does "入れた" here mean "insert", like choosing the song to sing to?
- Why is "に" used?
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人 is used to refer to the speaker himself. (In the scene, it is Madarame) It literally means "other person", from the perspective of the listener, hence the speaker himself.
Other examples might help:
Note that 人 can be really other - that is, a third person: The first of the above can also mean Listen to him/others.
入れた means just put. The standard verb to set a song in Karaoke (カラオケで曲を入れる) . You can think it as inserting the song into the list of songs to be played.
に might be a little irregular here, but a natural possibility is 人の入れた曲に合わせて.
歌うな is obviously omitted at the end of the phrase, so the whole phrase is like
(I'm not sure how to properly phrase this, but hopefully you see what I mean).