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Code Readme
Tkinter GUI Application Development Blueprints
Chapter 3: Drum Machine
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List of code samples:

3.01:   Creating OOP Based GUI structure
3.02:   Defining & Initializing the Data Structure 
3.03:   Displaying All Visual Elements
3.04:   Adding all the getter & setter methods for our data structure
3.05:   Loading drum samples
3.06:   Playing Audio
3.07:   Tkinter and Threading
3.08:   Adding support for multiple beat patterns
3.09:   Object Persistence: pickling and unpickling
3.10:   tkinter versus ttk Themed Widgets / new widgets introduced in ttk
3.11:   ttk widgets styling and theming explained
3.12:   applying ttk themes to our play button, stop button, loopbutton / adding separators