Changing what a ModuleScript returns?

It's not very complicated or sophisticated to do this.

I assume you would want a song request module, for the client only, not the whole server.

To do this, you would create a GUI with a TextBox and 2 TextButtons, a LocalScript inside of each button, and a ModuleScript in the GUI.

Setup

I'd setup the ModuleScript like this.

local mainModule = {}

mainModule.SoundTable = {} --// This is where the sounds will be added and removed.

return mainModule

The mainModule.SoundTable is basically the root of how all this will be controlled.

You can shorten this by using a function inside of the module, but either way works. I'll be doing it by the way of adding and removing it through the LocalScripts.

Inside of the AddFunction LocalScript I'd write this.

local soundModule = require(script.Parent.Parent:WaitForChild("SoundModule"))

script.Parent.MouseButton1Click:Connect(function()
    local songName = script.Parent.Parent.SongNameBox
    if table.find(soundModule.SoundTable, songName.Text) then --// Check if song is already in the list
        warn(songName.Text.." Is Already In The Queue!")
        songName.Text = ""
    else
        table.insert(soundModule.SoundTable,songName.Text) --// Adds the song to the list
        print("Successfully Added "..songName.Text.." To The Queue!")
        songName.Text = ""
    end
end)

This will check if the song is already in the list, if it's not then it will add the song into the queue.

Inside of the DeleteFunction LocalScript I'd write this.

local soundModule = require(script.Parent.Parent:WaitForChild("SoundModule"))

script.Parent.MouseButton1Click:Connect(function()
    if table.find(soundModule.SoundTable, script.Parent.Parent.SongNameBox.Text) then
        local songNamePos = table.find(soundModule.SoundTable, script.Parent.Parent.SongNameBox.Text)
        wait()
        table.remove(soundModule.SoundTable,songNamePos)
        print("Successfully Removed "..script.Parent.Parent.SongNameBox.Text.." From The Queue!")
        script.Parent.Parent.SongNameBox.Text = ""
    else
        warn(script.Parent.Parent.SongNameBox.Text.." | That Song Does Not Exist In The Queue!")
        script.Parent.Parent.SongNameBox.Text = ""
    end
end)

This will check if the song is in the list, if it's not then it will warn them and tell them the song was not removed as it doesn't exist in the list.

Hope this helped! You can also go farther with this by using a LocalScript and add a sound into the player gui everytime one song ends, remove it from the list and add another song and start playing that one.

But, if this helped don't forget to select this as an answer!