Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:4/4
K:D
['A2 F A2 D FA', 'f2 d f2']  
X:1
L:1/8
M:4/4
K:D
 B | A2 F A2 D FA | B2 G B2 D GB | A2 F A2 D FA | EFGA GFED | A2 F A2 D FA | B2 G B2 D GB | 
 ABcd efge | f2 d2 d3 :| e | f2 d f2 f df | geaf gfeg | f2 d f2 A df | e2 c e2 A ce | 
 f2 d f2 f df | geaf gfec | adcd efge | f2 d2 d3 :|  