Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:A
['a/a/a Aa caAa']  
X:1
L:1/8
M:4/4
K:A
 d |"A" cAce a2 ed |"A" cAEA"E7" GBBd |"A" cAce"D" aefd |"E7" ecdB"A" cAAd |"A" cAce a2 ed | 
"A" cAEA"E7" GBBG |"A" AcBd"D" cedf |"E7" ecdB"A" cAA | g |"A" a/a/a Aa caAa |"A" caAa"E7" BcdB | 
"A" a/a/a Aa caAa |"E7" BcdB"A" cAAg |"A" a/a/a Aa caAa |"A" caAa"E7" BcdB |"A" cAdB"D" eagf | 
"E7" ecdB"A" cAA ||  