What does ItemKey refer to in each tag type?

[Ferry-200]

Hello! Thanks for this great crate.

Recently I found it really convenient to get lyric by code:

        let tag = tagged_file.primary_tag().or(tagged_file.first_tag())?;
        return Some(tag.get(&ItemKey::Lyrics)?.value().text()?.to_string());

Because I can get lyric from music in different file format, such as mp3, flac, ogg, opus, wav, m4a, ...

Thus, I wonder what does ItemKey refer to in each tag type. Is it like this?

Id3v2: USLT, SYLT
Vorbis Comment: LYRICS
Mp4Ilst: ©lyr, ----:com.apple.iTunes:unsynced lyrics

[Serial-ATA]

Hello!

All of the ItemKey mappings are defined here: https://github.com/Serial-ATA/lofty-rs/blob/main/lofty/src/tag/item.rs.

ItemKey::Lyrics is for unsynced lyrics, so they map to:

• APE - Lyrics
• ID3v2 - USLT
• Mp4Ilst - ©lyr
• Vorbis Comments - LYRICS