Here's a live demonstration of how I learn new tunes using the program "Transcribe!" by Seventh String Software.
To view full screen, hover the cursor over the video and click the zoom icon in the lower right. While in fullscreen mode, click the "Scaling" button in the upper right to toggle between original size (1280x720) and filling the display.
I'm using the Windows version, but the program is also available for Mac and Linux systems.
Recording snippet from "The Irish Pipes Of Finbar Furey" - Nonesuch Explorer LP H-72048 1969