Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:3/4
K:D
['fd ec dB']  
X:1
L:1/8
M:3/4
K:D
 dA BG AF | GE FD EC | D/E/F/G/ EF BA | Bc de cA | ae fd ec | dB c/d/e/d/ cA | d/e/f/g/ af eg | 
 fa ea cA | af ge fd | ec dB cA | B/c/d/B/ A/B/A/G/ A/G/F/E/ | DB A/G/F/E/ D2 ||  