The "Guess Featured Artist" function breaks when presented with an artist enclosed in fullwidth parentheses (U+FF08 & U+FF09). Guess featured artists may need to be mddified to recognize more types of parentheses in its search cases.

I encountered the problem on this release. I tried putting a space before the opening parenthesis, but that didn't work. What did work was changing them to regular parentheses and then Guess Featured Artists worked.