Comment 3 for bug 139806

Pedro,

Ok, I'll try to make my point. Try to imagine the situation :

John is a music listener. He is constantly getting new music, while purging the ones he dislike, and also hearing some music from his library that he enjoys. He notices that he could listen music while on commute, and then buys a portable music player. So, he copies some of his music by hand to the device, and goes on listening to it.

About a month or two after it, John has downloaded new music, deleted some more, and also would like to copy different music from his library, he is tired of the ones he has been listening for over a month. So he does all that by hand - he finds the music he deleted on his pc, and deletes it on his music player - he finds his new music - and then copies it to the device - and finally delete some of his "archive" music, and gathers some other ones from the archive to replace them.

In order to keep his portable music player with new and fresh music, John has to do this EVERY so and so, and by hand. John could be helped by a computer system that lets him synchronize his library to his portable music player, that can follow advanced definitions such as :

1. Delete all the musics that were deleted on the local library
2. Copy [all] the musics that are [1 month] old on the library to the device
3. Copy a random selection of musics from the library to the device, and limiting disk usage to [90%]

Since John can set the commands, he has lots of flexibility, and always has updated, new, and fresh music to listen to, and he doesn't have to worry about manually handling with files - Ubuntu's Rythmbox does it all every time he plugs in the device and press "Sync".