I assume that you were compressing MP3s or something similar. The songs have already been compressed once, with the MP3 codec, and they can't be compressed any more without losing data. RAR, of course ...
If you want to compress and reduce the size of a large EPUB file in Windows 11/10, this post will interest you. How do I make an EPUB file smaller? To make an EPUB file smaller in size, you need to ...
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