To amplify what anti-sleep said, iTunes has a sort order. If your Master List is sorted by Artist, it sorts the individual songs by that artist first alphabetically by Album Title, then by Track #. If your songs have Album Titles but no Track numbers, it will sort them alphabetically within the Album grouping. If your songs have no Album Title, they will then appear alphabetically within the Artist grouping.
To see an alphabetical listing of all of your Artist's songs, select the Artist in the upper Browse section and then select Song Name sorting below. Or...sort your Master List by Song Name and type your Artist into the Search box (it will then limit the Master List to entries that match your search term).