Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
Q:1/4=120
M:6/8
K:Dmix
['G2 G', 'def gfe']  
X:1
L:1/8
Q:1/4=120
M:6/8
K:Dmix
 G2 G G2 G | GAG Bcd | G2 G GBG | FGA AFD | G2 G GBG | GBG Bcd | gfe dcB | ABG FED :: Bcd ded | 
 ded dcB | cde dfe | efe edc | Bcd def | gfe def | gfe dcB | ABG FED |]  