Have reported this to Apple but seriously frustrating. Previously if you imported a CD that was a compilation of various artists & it fragmented the tracks by artists it was easy to select all the tracks, get info & change the album artist details to 'Various Artists'. This would then bring all the tracks together into one album. Under iTunes 12.6 you cannot do this. Every single track has to be change individually. Every. Single. Track. I just imported a string of CDs with 200 tracks... Apple seriously borked some pretty basic parts of this update.