Most "320kbps" blogs are fake. People transcode 128kbps YouTube rips back to 320kbps. This creates a muddy, bloated file that looks like 320 but sounds like garbage.
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: Unlike a constant bitrate (CBR), where the bitrate remains the same throughout the file, VBR adjusts the bitrate according to the complexity of the audio. This means that more complex parts of the audio (like choruses or instrumental solos) can be encoded at a higher bitrate, while simpler parts (like quiet interludes) can be encoded at a lower bitrate. The result is a better quality audio for the same overall file size, or a similar quality audio with a smaller file size. 320kbps+vbr+mp3+blogspot