[bazza]

I use MSP to hold a library of folk tunes.  Usually additions are edited versions of an existing entry, i.e. a replacement, but it's not uncommon to add a tune and find there is already another, different, one with the same title (especially with Irish and Swedish tunes). Similarly, I'd often want to add the same tune in a different key, or with a different arrangement.  The option to retain one and rename the other is useful in these cases.