Final answer:
The Air from Bach's Orchestral Suite No. 3 matches the description of a slow march with a mournful melody, while the Gigue aligns with the quick, lively sounds of a key'd cornet.
Step-by-step explanation:
To match the descriptions to the Air or the Gigue from Bach's Orchestral Suite No. 3, we need to consider the characteristics of each piece. The Air is often referred to as "Air on the G String" and is known for its delicate, flowing melody and stately, dignified character, reminiscent of a slow march. It evokes emotions similar to those described in the passage, with phrases like "young man's heart's complaint" aligning with the mournful yet beautiful qualities of the Air.
The Gigue, on the other hand, is a lively, fast-paced dance characterized by its upbeat tempo and engaging rhythm. The reference to the key'd cornet that "glides quickly in through my ears" and "shakes mad-sweet pangs through my belly and breast" captures the energetic and spirited nature of the Gigue.
Therefore, the appropriate matches would be:
- Air - The slow march play'd at the head of the association marching two and two.
- Gigue - I hear the key'd cornet, it glides quickly in through my ears.