Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:4/4
K:D
['eg g2']  
X:1
L:1/8
M:4/4
K:D
 ag | fdAd f3 a | geBe gbag | fdAd f2 fe | defd e2 dg | fdAd f3 a | gebg eg g2 | fdAd f2 fe | 
 defd e2 df | a2 ag fgaf | efgB eg g2 | a3 g fdec | defd ef d2 | abag fgaf | efgB eg g2 | 
 a2 ag fdec | defd ef d2 |]  