Craft a musical work based on the specified structure and given theme.
X:1
L:1/8
Q:1/2=50
M:4/4
K:D
['time sig in df fd f2 c2', 'fa f2'  
X:1
L:1/8
Q:1/2=50
M:4/4
K:D
 d2"_No time sig in MS" df fd f2 | c2 ce ec e2 | dfeg fage | fdec d2 D2 || (fafd) fa f2 | 
 egec eg ec | fafd fa f2 | fdce d2"^End" D2 |]  