-Multiple story changes. Basically from Mt. Rock on is different with some other cutscenes thrown in during the other part of the game to elaborate on shaky parts in the Xbox360 version.
-Crescendo and Serenade are playable. Crescendo is a heavy, yet slow hitter with a lot of defense, but his skills lack in damage slightly. Serenade is also a heavy, but slow hitter with powerful skills, yet low defense. Both earn two light and two dark attacks.
-Two new dungeons. Lament: The Royal Mirror is the extra story dungeon with a pretty difficult boss at the end, and where you first get Crescendo and Serenade. Church of EZI is the second Secret Dungeon, and from what I've heard, is a great deal harder than MU.
-Many item locations have been changed. I remember there being a topic that listed all the item location changes, but I forget the name of it.
-The levels at which you get many of the skills are changed. Ex. You get Void Edge very early in this version, Salsa starts with Solar Flare and Shadow Silhouette instead of Grand Slam, Spirit's Pathway is gained in Chopin's 20s instead of 10s, etc. It certainly makes the game different.
- Alternate costumes for the characters. Allegretto and Beat get one new costume each, and Polka gets two new ones.
-Enemies give MUCH less EXP. After watching Xbox360 videos, I noticed that you gain around 30% give or take 5% of the enemy's exp in the PS3 version. IE, Waltz gives 280,000 in the Xbox360 version, and around 80,000 in the PS3 version. This makes the game MUCH harder since you'll be much lower level throughout the game.
-This isn't confirmed, but it seemed to me that the enemy's stats were higher in this version.
-Boss battles have been added/changed. I won't spoil anything though for the changed ones.
-Bosses are actually shown dieing. Waltz just doesn't vanish after you beat him; he actually has a death scene...and that's all I'll say about that...
-I'm not completely certain, but I'm pretty sure that the PS3 gets an extra Chopin Piano piece (Minute Waltz).
-New equipment, not sure about new items.
-Photos give MUCH less money now, so while you can still get easy money from it, it's just slightly more tedious.
voilà les differences les plus notables
30% d'exp en moins...voilà pourquoi je suis lvl40 à la fin sans jamais avoir fui un combat...