Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
['B2 e2 d2 cB A2 BA GFED', 'f2 ed']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
 B2 e2 d2 cB | A2 BA GFED | GDGB AGAB | GDGB AGAB | B2 e2 d2 cB | A2 BA GFED | c2 BA B2 AG | 
 EGFA G4 :: d2 g2 f2 ed | e2 fe dcBA | dAdf edef | dAdf edef | d2 g2 f2 ed | e2 fe dcBA | 
 g2 fe f2 ed | Bdce"^D.C." d4 |]  