Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:4/4
K:A
['e2 cA cdef', 'a2 ef'  
X:1
L:1/8
M:4/4
K:A
|: e2 cA cdef | =gedc BcdB | e2 cA cdef | =gedB cA A2 | e2 cA cdef | =gedc BcdB | cAcd edef | 
 =gedB cA A2 :: cAce a2 ef | =gedc BcdB | eA A2 a2 ef | =gedB cA A2 | cAce a2 ef | =gedc BcdB | 
 A2 (3Bcd eaaf | =gedB cA A2 :|  