Has anyone else got the problem with artists or albums being under unknown artist and when you re-tag them as what artist they are it does nothing they stay as unknown artist. Really annoying cause 300 songs are in unknown artist. Some albums have 10 songs of 13 as unknown artist and the other 3 are know for the real artist. I have the same songs on my computer in iTunes and I do not have this problem.
I didn’t find the right solution from the Internet.