In Album Art View and Album Art Detail View each group of albums has a header with an expand-button, a subcategory (initial, year, genre, etc) and the number of albums in that subcategory. Those groups vary with the choosen sorting criterion.
The grouping is not very consequent. Artist and album are grouped by letter. Sorting by count (who sorts his albums by the number of tracks????) results in groups of 10, 20, ... more than 50 tracks. Sorting by length (also very practical!) gives groups of 10, 20 etc minutes. But sorting by year makes a group of every single year.
In Album Art View this has undesirable effects: if I want to see my Beatles sorted by year (a useful and common sorting) the albums are spread over 5 pages. And there is no way to get them together...... (I could put them in a playlist "Beatles by year", but that goes too far)
I should like a optional grouping. More or less the way it works in Windows Explorer: "Arrange Icons by Name, type etc.", and separately "Show in groups" (or not!). A checkbox in the View menu can do....