Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
M:6/8
K:Bb
['B2 c d2 B c2 A B2', 'f2 d e2 c d2 B def']  
X:1
L:1/8
M:6/8
K:Bb
 B2 c d2 B | c2 A B2 G | (dBG) (GBG) | (dBG) (GBG) | B2 c d2 B | c2 A B2 G | (cBA) (FAF) | 
 (cAF) (FAF) || f2 d e2 c | d2 B def | (dBG) (GBG) | (dBG) (GBG) | f2 d e2 c | d2 B def | 
 cAF (FAF) | (cAF) (FAF) ||  