Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
Q:3/8=80
M:6/8
K:D
['A/A/ AFG A2 A AFA D2 A']  
X:1
L:1/8
Q:3/8=80
M:6/8
K:D
 A/A/ | AFG A2 A | AFA D2 A | d>ed fef | d3 z d>e | f>ed eeA | BAB ccB | dcB AdF | E3 z F>G | 
 A>BA AFA | D3 z |]  