The Flower Violeta theme has been replaced by an instrumental version in GMS. Here is the original version with lyrics.
GMS 1.56 - 10/29
Bgm38/FlowerVioleta - instrumental version (named ‘FlowerVioletaInst’ on OneDrive)
Some people have requested sound effects from MapleStory 2. Here’s an archive with some character movement sound effects: link.