Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:6/8
K:Bb
['D GAG GFD BAB cBc ded cBA', 'G2 d fdd dcB cBc c2 B/c/'  
X:1
L:1/8
M:6/8
K:Bb
 D | GAG GFD | BAB cBc | ded cBA | G3- G2 D | GAG GFD | BAB cBc | ded cBA | G3- G2 || d | fdd dcB | 
 cBc c2 B/c/ | dcB GFD | F3- F2 D | GAG GFD | BAB cBc | ded cBA | G3- G2 |]  