import tkinter as Tk

class Cmdwd():
    lyrics = [
        'After the war I went back to New York',
        'A-After the war I went back to New York',
        'I finished up my studies and I practiced law',
        'I practiced law, Burr worked next door',
        'Even though we started at the very same time',
        'Alexander Hamilton began to climb',
        'How to account for his rise to the top?',
        'Man, the man is',
        'Non-stop'
        ]
    ref = 0

    def __init__(self):
        self.root = Tk.Tk()
        self.root.wm_title('Non-stop')
        self.root.minsize(width=0, height=50)
        self.lyric = Tk.StringVar()
        self.lyric.set(self.lyrics[0])
        # self.message displays the lyrics
        self.message = Tk.Message(self.root,
                           textvariable= self.lyric, fg= 'blue', width=400,
                           )
        self.message.pack(fill='y', expand=True)
        # self.button displays the next button
        self.button = Tk.Button(self.root,
                             text= 'Next', fg= 'red', width=10, height=3
                             ,command = self.advance)
        self.button.pack()
        # self.text displays the song title
        self.text = Tk.Message(self.root,
                            text='Hamilton, Non-stop', fg='green', width=400
                            )
        self.text.pack()
        self.root.minsize(width=500, height=200)
        self.root.mainloop()



    # this function advances the lyrics
    def advance(self):
        self.ref += 1
        if self.ref >= len(self.lyrics):
            quit()
        self.lyric.set(self.lyrics[self.ref])

Cmdwd()