Error in music script?

Hi! Please excuse the large script. It is mainly space. I need help finding out what is the problem with my script. I have put it prevention measures but that doesn't seem to work. Here is the problem:

Whenever you stop listening to the music, it will still do the wait time and play the next song. Even though the music SHOULD be off. I really need help. Please?

playing = false

     local s1 = script.Parent.Parent.song
    local s2 = script.Parent.Parent.song2
    local s3 = script.Parent.Parent.song3
    local s4 = script.Parent.Parent.song4



    script.Parent.MouseButton1Down:connect(function()

        if playing == false then -- check if audio is playing

            playing = true -- allow the script to know if its on or not

            script.Parent.Text = "Music: On" -- change the name like you wanted

                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()   
                wait(0.5)       

            s1:Play() -- play all the music

                wait(120)
    if script.Parent.Text == "Music: Off" then
                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    end

                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()

    wait(1)
if script.Parent.Text == "Music: Off" then
                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    end
                s2:Play()

                wait(106.371)
    if script.Parent.Text == "Music: Off" then
                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()

    end

                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    wait(1)
if script.Parent.Text == "Music: Off" then
                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    end
                 s3:Play()

                 wait(101)
    if script.Parent.Text == "Music: Off" then
                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    end

                 s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    wait(1)
    if script.Parent.Text == "Music: Off" then
                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    end

                s4:Play()

                wait(76)
    if script.Parent.Text == "Music: Off" then
                s1:Stop()
                s2:Stop()
                s3:Stop()
                s4:Stop()
    end

                s4:Stop()
    wait(0.1)
    script.Parent.Text = "Music: Off"

        else -- if audio is playing we want to stop it

            playing = false


                s1:Stop()

                s2:Stop()

               s3:Stop()

               s4:Stop()

               script.Parent.Text = "Music: Off"

        end

    end)