This was written two years ago. Am I right in assuming that the scheme @joel mentions would make it possible to combine all of the parts of a composition into one composition WITHOUT adding WORK and PART tags? If so, then I really can’t wait for this solution to be rolled out! There are literally thousands of tracks in my collection that are waiting to be grouped!
See also my recent post here: Classical album contains grouped tracks in one composition as well as ungrouped tracks