Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/4
M:4/4
K:D
['D F A2 G/A/B/c/ A2 d c', 'B A']  
X:1
L:1/4
M:4/4
K:D
 D F A2 | G/A/B/c/ A2 | d c A F | G/F/ E D2 |: A A B A | d e c B | A c d A | (F2 A B | A G) F2 | 
 A A F E | D D A A | F A B A | (F B A F) | E2 D2 | D F A2 | G/A/B/c/ A2 | d c A F | G/F/ E D2 :|  