'Tutorials' is where people who have made a tutorial to share with others can post them.
I'm not 100% clear about where this should go. You have posted in VX Ace tutorials, the info under your avatar, however, says that you are using VX and you are asking about plugins, which are for MV. Both VX and VX Ace use scripts. I'm going to assume that it's for Ace. If it's not, please post and state which engine you are using.
However, as far as I am aware (and I could be wrong) there is no need for a script for this. You simply convert the music file into a format which the engine can read and the sound itself is unaltered. For Ace, you can convert your file to .ogg using
this site.
It is also possible, given your wording, that you are asking for a plugin for FL Studio 10. In which case you might be better asking on a forum which deals more specifically with that software.
[move]RPGMaker VX Ace[/move]