Broken Script, Help?

Hi, I'm trying to make a script that display's the current song (cursong) upon the screen with a screen gui, But, I keep having issues and it doesn't want to work. Here's what I got.

local info = game.workspace.part.surfacegui.cursong:InvokeServer()
if info ~= nil then
    script.Parent.TextLabel.Text = "Now Playing: " .. info
end