I have over 8,000 tracks on iTunes and time and time again this issue appears .... I will remind people that typed text is read as digital code and sometimes iTunes gets a little confused with spaces in the text .. That being said, taking one track and selecting the artist name » album artist » album artist does not always work... Myself, I always follow these steps ..


1. I copy the artist name and paste it to all the get info of each track
2. I then change all but one track with A! in each artist and and album artist and album.... I keep one as a control.
3. I then copy from the control track the artist name and all other relevant information that is required to group them together.
Okay, you might find that only some of the track group together. Next step is to get them all together. Copy the rouge track to the desktop and delete them from the iTunes library to the TRASH. Then, making sure you are on that artists page in your iTunes library , add the tracks to your library.





These are just a few of the steps I've take... and remember, as I always say, when you copy and paste, make sure you are only copying the TEXT and no spaces after it... a space is readable by iTunes as a character!
Note - You might have to quit iTunes completely, the restart it and then add the tracks from the desktop... try different steps and see what happens...