Create a musical composition that adheres to the provided structure and theme.
X:1
L:1/8
M:2/4
K:G
['D GFGA B2 GB AGFA G2']  
X:1
L:1/8
M:2/4
K:G
 D | GFGA | B2 GB | AGFA | G2 z D | GFGA | B2 GB | AGFA | G2 z |]  