Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
Q:1/4=100
M:2/4
K:G
['g fddd d2 c2 BGGG Bd-dg fddd']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:G
 g | fddd | d2 c2 | BGGG | Bd-dg | fddd | e2 d2 | aAAA | c e2 |:  