Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:D
['FABA cBAF Bcde fedA FABF AAAF', 'ABBB FABA cBAF Bcde fedB FABd cAAA', 'FABd efaf', 'ABBB FABd efff aefa bafe dBBB cAce']  
X:1
L:1/8
M:4/4
K:D
 FABA cBAF | Bcde fedA | FABF AAAF | EFFF ABBB || FABA cBAF | Bcde fedB | FABd cAAA | faec dBBA || 
 FABd efaf | efaf edcA | FABd efaf | edcB ABBB || FABd efff | aefa bafe | dBBB cAce | faec dBcA ||  