Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:2/4
K:G
['B/c/ dB/c/ dB/c/ dB GB/c/ dB/c/ dg', 'z z'  
X:1
L:1/8
M:2/4
K:G
|: B/c/ | dB/c/ dB/c/ | dB GB/c/ | dB/c/ dg | f2- ff/g/ | az/.f/ az/.f/ | a/g/f/e/ d>e | 
 dz/c/ BA |1 G2- G :|2 Gg f=f || e2 c2 | Gg g/f/e | d z z B | Gg fg | a z z f | da ^ga | b z z g | 
 dg f=f | e2 c2 | Gg fe | d z z B | Gg fe | de/d/ cd/c/ | EF/E/ FG/F/ | GA/G/ GA/G/ | Gg g/f/=f | 
 e z z c | z G z g | d z z B | z G z g | a z z f | z d z a | b_b a_a | gf =f2 | e z z c | z G z g | 
 d z z B | z G z g | d2 c2 | E2 F2 | G2- G2 | G2 G ||  