Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
M:9/8
K:D
['BAB dBA A3 BAB dBd edB def', 'eAA efg']  
X:1
L:1/8
M:9/8
K:D
|: BAB dBA A3 | BAB dBd edB | def gaf g2 e | dBd G (3Bcd fed :: eAA efg f3 | eAA efg agf | 
 eAA efg (3faf e | dBd G (3Bcd fed :|  