Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:2/4
K:D
['B2 GB', 'af bg a2 fa'  
X:1
L:1/8
M:2/4
K:D
 Ad Ad | B2 GB | Aafd | ceea | fd AF | B2 GB | Ad ce | fd d2 :| af bg | a2 fa | gefd | ceef | 
 af bg | a2 fa | ge a2 | fd df | af bg | a2 fa | gefd | ceea | fd AF | B2 GB | Ad ce | fd d2 ||  