Most MP3s use Constant Bitrate (CBR), which applies the same amount of data to every second of music. A silent pause gets the same data as a complex orchestral crescendo.
If you are navigating the world of digital music archives, not all "VBR" files are created equal. Here is what to look for in a top-tier collection: vbr mp3 collection blogspot top
The LAME encoder’s "V0" setting is the most famous VBR preset, aiming for the highest possible quality while remaining significantly smaller than a CD-quality file. The Blogspot Legacy: Why the Search Continues Most MP3s use Constant Bitrate (CBR), which applies