What you are training
Prosody is the agreement between what a lyric says and how the music says it. A line about falling should not rise; a stable, resolved chorus should not sit on an unresolved chord; a stressed syllable should land on a strong beat. When those things match, a listener believes the song without knowing why. When they clash, the song feels off even if every line rhymes. Most songwriting advice is a special case of prosody, and most amateur songs break it somewhere. This drill shows a lyric line and two musical settings and asks which one agrees with the words, then explains the mismatch in the other: the melody rising against a falling image, the stress landing on the wrong word, the harmony resolving where the lyric does not. Six rounds train an instinct that will start correcting your own melodies as you write them.
After this drill, the plan: The daily plan drills stress placement next, the most common prosody break in first drafts, on lines from your own songs.