>yes, genres are tricky, but i disagree that it would be silly to have
>an album listed under multiple genres.  whats the problem with that? 
>once you went into the album, you'd only see songs matching the genre.
>
>what i am trying to say is that i think starting a sort with genre
>would be fine.
>
If there is a list of things, and a list is sorted in different ways, I'd 
expect the same number of items in the list, but ordered differently.
If some attributes (columns) of items (rows) have multiple values, it's not 
really possible to sort it (but instead can be considered as a grouping).

Some people like to see the whole album, even if they browse to the album via a 
filtered list, eg. Browse Genres > [genre] > [album] could either show all 
songs on the album, or only songs that were in the selected genre.

I think it would be useful to implement a switch within a menu/view (toggle to 
show all songs on album, or filtered), rather than a global setting.

>duplicating an album is not always a problem.  if you don't want an
>album to duplicate, then just pick it first in the sorting method.
>
That's not a solution all the time.  It's the cartesian product of all items in 
the join.  There may be a sort on album first, but when there are linked items 
that have multiples, it results in multiple rows/duplicate albums, which would 
be especially confusing/awkward to visualise on SBS players (eg. 2-line 
Squeezebox classic player UI).

eg. What if you want to sort by album and then artist contributors, when 
different songs have multiple contributors?  Or album and then genre.  What if 
you want a list of any type of contributor, whether it be an artist, band, 
composer, conductor?
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