Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:C
['dA A2', 'd2 fd']  
X:1
L:1/8
M:4/4
K:C
[M:4/4][K:D] aeb[Q:1/8=360]dA A2 dAFA | deef g2 fe | dA A2 dAFD | [EG,]2 E2 c2 BA | dA A2 dAFA | 
 deef g2 fe | dA A2 dAFD | e e2 e c2 BA :| d2 fd adfd | d2 fd g2 fe | d2 fd adfd | e e2 e c2 BA | 
 d2 fd adfd | d2 fd g2 fg | afge fdec | [EG,]2 E2 c2 BA :|  