Someone from the internet told me this about an MP3 Collection that I had: “The collection is good, but the MP3 quality is not. All the files are re-encodes and were not originally sourced from lossless audio. Rather disappointing ” By the way, the MP3 files mentioned are labeled 320 KBPS CONSTANT BIT RATE in their tag data, and they are in technically 320 KBPS CONSTANT BITE RATE. I asked him to explain to me how he knew that these MP3’s were re-encoded from a lossy audio format, but he never replied back (after I asked him two times and 5 months have passed he or she hasn’t replid). So here is my question: 1) How do I know if my MP3 file is re-encoded from a lossless file format? What program do I use to determine this? Is it my only optione to use my listening abities? 2) How do I know if my 320 KBPS MP3 file is re-encoded from another MP3 with a lower bit rate? What program do I use to determine this? Is it my only option to use my listening abilities? By the way, these files were not ripped from me or from my CD’s and they aren’t downloaded through music distribution and sales software like Itunes and Rhapsody etc.