If you select a track and view the info of that track, you will find the there is probably missing information. Primarily the Album name.
Put in the album name and you will find that iTunes can group together all tracks that belong to that album.
I have a folder that contains all my music, separated into subfolders.
I have imported the music into iTunes.
Some of my folders are collections of songs that I download onto an mp3 player, and are named as such (AA Dons Chill, AB Dons Chill, AC Dons Chill, Christmas compilation etc etc...you get the idea).
When I try to play one of these collections using iTunes, I cannot find the collections. If I try to play the music direct from the folder, I only seem to be able to play one track at a time.
I have also noticed that iTunes Does not list an Album called Millennium Songs, instead the individual songs are listed separately and identified as coming from Millennium Songs.
Am I being thick, or am I expecting iTunes to operate in a way it was not designed to do.