Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
Q:1/8=180
M:6/8
K:D
['GBG FAF D2 B', 'G2 B']  
X:1
L:1/8
Q:1/8=180
M:6/8
K:D
 GBG FAF | D2 B BAB | GBG FAF | D2 B BFD | GBG FAF | D2 B BAB | F2 B dBG | ABG FED :: G2 B dBd | 
 edB dBA | G2 B dBG | ABG FED | G2 B dBd | edc def | gfe dBG | ABG FED :|  