Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/4
K:A
['B4 cA cA A2']  
X:1
L:1/8
M:2/4
K:A
|:"A"{d} c2 eA c2- cB |"A" c2 eA"F#m" F4 |"A" c2 eA c2 cB |"A" cdec"E7" B4 :| 
"A"{d} cA A2"D" fa"A"ea |"D" fa"E7"ed"A" cA A2 |"A"{d} cA A2"D" fa"A"ea |"D" fa"A"ec"E7" B4 |] 
"A"{d} cA A2"D" fa"A"ea |"D" fa"E7"ed"A" cA A2 |"D"{g} a2 ag afec |"E7" B4- B4 |]  