Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:D
['BADA dAFA', 'dfaf bgaf']  
X:1
L:1/8
M:4/4
K:D
 BADA dAFA | BADA defd | BADA dAFA | dcdf e3 d | BADA D3 A | BADA defd | BDAD dDAD | dBaf e3 d || 
 dfaf bgaf | dfaf g3 e | dfaf bgaf | dBAf e3 f | dfaf bgaf | bgaf g2 fg | agfe dBAB | dBaf e2 d ||  