The iPod and iTunes will group artist using the "album artist" tag, not the "artist" tag. But CopyTrans Manager groups artist by "artist" tag. So in CopyTrans Manager an album where one major artist does duets with different guest artists (say Frank Sinatra does one song with Bono and another song with David Bowie) iTunes will have "album artist" tag as "Frank Sinatra" so the entire albums shows up as one album by Frank Sinatra. CopyTrans Manager will show the same set of files as multiple albums (artist tag will have the special guest artist for each different track). So if you want to get the same groupings in CopyTrans Manager that you get on the actual iPod, you should change that to use the "album artists" tag