you'll also see a tag for "Synchronized lyrics", which basically includes timestamps with the lyrics (but for me a first implementation with just unsynchronized lyrics would suffice)
I think it would be great if at least also unsynchronized lyrics via "Vorbis comment" could be supported, as this should cover other common audio formats (vorbis, flac, ogg, opus), its basically just the entire lyrics as a plaintext comment tag (with newlines)
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Please, give me a link for example of the such file.
A little late reply, but I just saw this ticket and would like to provide more information: