I'd like to have the ability to group duplicate songs
All songs in a "duplicate group" should have the same
"last played" timestamp.
The point would be avoiding hearing songs of which I
have dupes more often than others.
Just cleaning out dupes from the song archive isn't as
good. Let's say you have somebody's "greatest hits",
as well as one other album. In this case you probably
don't want to cripple one of the albums, but you may
still want to mark duplicates as such.