Guess Featured Artist should support fullwidth latin script for both parenthesis (U+FF08 & U+FF09) and join phrases (like “　ｆｔ．　” ). This is generally used in CJK countries.

 For example, see https://musicbrainz.org/release/afd54f86-0fae-4ab7-84dc-9edf3c257d75 & https://cight.bandcamp.com/album/-

It should additionally preserve join phrases in fullwidth Latin script, and convert incidental not-fullwidth characters.