You can copy the mp3s to another playlist, yes, so you could have the same songs under the original albums and under other compilations.

But if you change the tags on the mp3s from within emplode, they will be changed every place that song exists, so that ``The Battle of Evermore'' will appear to come from ``Led Zeppelin IV'' whether you're playing ``IV'' or you're playing it within a ``Remastered'' playlist.

This is the case because the all the playlists will point to the same ``file'', and it is that ``file'' that stores the tag info. (I put quotes around ``file'' because it's actually a pair of files.)