Final answer:
The D major scale is completed by the notes a, b, c♯, and d. The phrase ‘Every good boy does fine’ is an example of a mnemonic device used in music learning.
Step-by-step explanation:
The question asks to finish the major scale starting on D. The correct notes to complete the D major scale are: a, b, c♯, d. When learning how to play the piano, the mnemonic "Every good boy does fine" is used to remember the notes E, G, B, D, and F for the lines of the treble clef.
This is an example of a mnemonic device, which is a learning tool that helps people remember information by associating it with easy-to-remember phrases or words.