Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:2/2
K:D
['cdec A3 d AGEd']  
X:1
L:1/8
M:2/2
K:D
 B |"A" AGFE"D" D2 FD |"G" GEFE"D" Ddcd |"A" AGFE"D" DEFD |"C" EG=cA"G" BGE :| d |"A" cdec A3 d | 
"A" cdec"G" AGEd |"A" cdec ABAG |"C" EG=cA"G" BGEd |"A" cdec A3 d |"A" cdec"G" AGEd | 
"A" cdeg fdec |"A" ABcA"G" Bdc |]  