IF... you were to follow the instructions in some Threads in this Forum and manually delete the \Microstudio folder, and your songs are in \Microstudio\Songs, then yes, YOU (not the uninstaller) would delete your songs.
If you want to be absolutely safe, move the files to another folder, such as C:\songs.
Microstudio 4.0 has a Browse button that you can find any folder and make it your new default from then on until you change it again.
