Desktop Program to maintain the music library

I am looking for a desktop program to maintain the music library offline. (i.e. using the backup data)

I am thinking of a program which can be used to
- create and reorder play lists
- change mounting points (paths to music)
In case there is an IP command to play a certain song in the DMP, it could also do that.

Do you know such a program, and if not, would that be something you would like to use?