What is the difference between ID3v1 and ID3v2 tags?
ID3v1 Tags: The ID3v1 tag occupies 128 bytes, beginning with the string TAG. To maintain compatibility with older media players the tag was placed at the end of the file. The small tag size only allowed for 30 bytes for the title, artist, album, and a “comment”, 4 bytes for the year, and a byte to identify the genre of the song from a list of 80 values (Winamp later extended this list to 148 values). Long song or album titles were simply truncated. Track number accepts only numeric values(1,2,3) so you can not add leading zero before track number as you can do with ID3v2 tags (0x – 01,02,03). ID3v2 Tags: ID3v2 tags are of variable size, and usually occur at the start of the file, to aid streaming media. They consist of a number of frames, each of which contains a piece of metadata. Frames can be 16MB in length. In the latest ID3v2 standard there are 84 frames, and applications can also define their own. There are standard frames for containing cover art, BPM, copyright and license, lyr
