I had read somewhere recently that because ID3 v2 tags are at the start of the Mp3 file, that making substantial changes to the tags (such as adding album art) results in the entire file having to be re-written to accommodate the new data.
This got me thinking that if the file is re-written, could the audio quality be affected? I use Exact Audio Copy to rip all my CD’s at a high bit rate. I am rather fanatical about quality. It would concern me if the addition of tag data could somehow lower the audio quality during the process of making room for the new data.