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The term "repack" usually belongs to video game piracy—a scene release that fixes an error. In music, a "640 kbps repack" refers to a user-encoded file that claims a bitrate of 640 kilobits per second. 640 kbps songs repack
Why 640? It sits in a no-man’s land. Standard MP3 caps out at 320 kbps. AAC (Advanced Audio Codec) caps at 512 kbps. OPUS, the modern king, maxes out at 510 kbps for stereo. So where does 640 come from? Look for these scene tags in your search:
Here is the controversial heart of the 640 kbps debate: The law of diminishing returns. So why do people want 640 kbps repacks
So why do people want 640 kbps repacks?