Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
Q:3/8=120
M:6/8
K:Bb
['b2 g afd', 'fgf fcA']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:Bb
 a | b2 g afd | b2 g afd | f2 f f2 a | f2 f f2 a | b2 g afd | b2 g afd | g2 g g2 b | g2 g g2 :| A | 
 Bcd cBA | BAG AFD | fgf fcA | fgf fcA | Bcd cBA | BAG AFD | gag gdB | gag g2 A | Bcd cBA | 
 BAG AFD | fgf fcA | fgf fcA | Bcd cde | dcB AG^F | G2 G G2 B | G2 G G2 |]  