You cannot experience the with iTunes or basic Windows encoders. You need the right tools.
Variable Bit Rate (VBR) MP3 encoding balances audio quality and file size by allocating bitrate dynamically across a track. This post explains what VBR MP3 is, when to use it, how to create and optimize files, and practical tips for distribution and playback. Vbr Mp3 World
: VBR aims for a consistent level of quality across the entire track. This often results in a file that sounds as good as a high-bitrate Constant Bitrate (CBR) file but occupies significantly less disk space. You cannot experience the with iTunes or basic