The number "320kbps" refers to the bitrate of the MP3 files. In the hierarchy of digital audio, 320kbps CBR (Constant Bit Rate) is the gold standard for standard MP3s. Here is why you should refuse anything lower than this when searching for the Mayhem tracks:
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That said, the search term often refers to sent to DJs or radio stations. Some "fixed" ZIPs are actually rips from legal promo sources that had encoding errors—fixing them falls into a gray area but is widely tolerated in fan communities. lady gaga mayhem track 1 6 320kbps zip fixed
If you are looking for these specific tracks, you don't need to risk a ZIP download. There are safer ways to explore Gaga’s vault: The number "320kbps" refers to the bitrate of the MP3 files