Passenger, the actual CVR recordings are seldom (if ever?) released to the public - only the transcript is released. I've listened to exactly one - and that because I was directly involved in the investigation. Suffice to say it wasn't a pleasant experience...
Even the transcripts (and FDR data) is generally kept tightly controlled until the investigation report is released - if there is something 'significant' it may be released to the public in a general sense during a press conference held by the investigating authority (e.g. the NTSB public statement a few days after Asiana that there was no evidence of an aircraft malfunction)