This is actually something I've been wondering about for a while now.

So theres the main soundtracks (OSTs) for each season/the movies, and the Memorial Music Box. From what I understand the MMB has tracks that weren't released before on the other OSTs...as well as tracks that where released on those OSTs.

So how much of the MMB repeats from the previously released OSTs? I already have all of the main OSTs on my iPod, is it worth going after the MMB as well? (I ask because I hate having repeat tracks in my music collection.)

The majority of the original soundtracks are also included on the Memorial Music Box CDs but there are exceptions to that as many of the Music Collection Extra Version CD's soundtracks are not included on the Memorial Music Box Album. This also applies to some main soundtrack CD titles so the Memorial Music Box does not hold every single previously released soundtrack.

I think that the Memorial Music Box soundtracks are definitely worth to download even though you will get duplicated tracks when downloading the music. The best way to avoid most duplicates would be to first download the Memorial Music Box tracks and search for the missing tracks from the OST albums. What makes this a bit tricky is that both, Memorial Music Box and OST CDs, have different names for the tracks and that both of them also combined multiple background music titles into one track.