Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:2/4
K:C
['c c', 'e e']  
X:1
L:1/8
M:2/4
K:C
 G G A B | c2 c G | A2 A2 |1 G4 :|2 G3 G || c c c d | e2 e c | e e e d/ c/ | e2 d2- | d3 G | 
 c c c d | e2 e e | d2 d2 | c4 |]  