Compose a piece adhering to the given musical structure and theme.
X:1
L:1/8
M:6/8
K:Bb
['(d2 c)', 'a2 g f2 =e f2'  
X:1
L:1/8
M:6/8
K:Bb
 (FG).F | (d2 c) (d2 c) | B2 d (FG)F | (e2 d) (e2 d) | c2 f (FG)F | d2 c B2 A | G2 =B cde | 
 dcB BcA | B2 z || (cd)c | a2 g f2 =e | f2 c cdc | a2 g f2 =e | f2 z (f=e)d | c2 c (dc)B | 
 A2 A (cB)A | Gdc BAG | F2!D.C.! F :|  