WinRAR at maximum compression of music files spoils their quality or not?

Question

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WinRAR at maximum compression of music files spoils their quality or not?
If you pack a lot of music into an archive with maximum compression, will the quality of the songs deteriorate or not?

Answer 1

WinRAR does not change the contents of the files during compression, the quality remains the same.

Answer 2

Archivers use lossless compression, which is less efficient than lossy compression.
From here two conclusions:
1) no, the quality will not change.
2) but the size will not decrease either, since the information is already compressed by a more aggressive algorithm.