Need help with rar file password

Hi guys
I have winrar installed on my pc and have used this program successfulle to open .rar files in the past.
My problem now is; I have downloaded a torrent of 108 mb in a rar format (again) , but this time it needs a password to open the mp3 files to be used. Can anybody adise on how to crack or do something with this tfle without a password.
There was no password attached to the file when downloaded.
Looking forward to some clever advise

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