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
['D2 FA dfed c2 Ac B2 GB', 'b f a2 a fdef gbfa ec', 'DFAF DFAF']  
X:1
L:1/8
M:4/4
K:D
"^A" D2 FA dfed | c2 Ac B2 GB | A3 A FAdf | g2 f2 ec d2 ||"^B" f a2 a fdef g b2 b | f a2 a fdef | 
 gbfa ec d2 ||"^C" DFAF DFAF | DGBG DGBG | DFAF DFAF | A,CEC A,CEC | DFAF DFAF | DGBG DGBG | 
 ABAG FAdf | g2 f2 ec d2 |]  