Add/update notes on current possible resolution for passing @user_input-specified playlist into visit_playlist
Update notes
Add class/methods for experimenting with .mtime and .atime; check when files were last read-from and/or written-to
Create experiment file for deep-browsing directories, subdirectories, files, etc...
Rework code into Class/methods
Rename get_current_dir => get_path
Remove instance variable from get_path; add @paths