Split this to two methods.

playDeathSound and playFoodSound

startBGM might be a better name.

Here i simply used BGM because this is doing both the tasks of starting and stopping the background music. And it is working in way that at every alternate calls it will start and stop the BGM

This makes the actual function of method hard to understand when reading the code unless you open the function definition. Consider splitting it into StartBGM and StopBGM

Try to start the method with a verb to better capture purpose of method.

Better design is to split this into Start and Stop methods. Or alternatively change the signature to something like this-

enum MusicStatus
{
    Start,
    Stop
}
setMenuMusic(MusicStatus status);

I divided the method into 2 parts i.e start and stop

Same thing as before passing the bool, What is it doing?
Else rename the method as SetMenuMusic. That way it becomes
setMenuMusic(true) which anyone reading the code will know that it's going to loop the menu music as opposed to menuMusic(true) which can be anything like should the music loop? use 5.1 channel? etc

SoundController or SoundManager will be the correct name. Since Sound hints to being an object wrapping over the .wav files.

I changed the class name to SoundController , will it be okay if the file name remained the same.

Ideally file name should reflect the class name. Since in this case only 1 class exists in the file I would strongly suggest renaming the file as well.

I think you missed this. Also out of curiosity, why did you have to make this change?

Oh sorry actually in order to fix the error temporary i used menu[] array so i just changed the name there so it wouldn't give me error. You can see menu array is declared at the bottom of MainMenu class in MainMenu.h under the private part.

If you don't require anymore. Please remove these workaround code.

Please remove the temporary fix.