Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:Amix
['', 'aefd c2', 'cAAg fded']  
X:1
L:1/8
M:4/4
K:Amix
 g |: aefd c2 Ae | cA A/A/A aeeg | aefd c2 Ad | BG G/G/G gBBe :| cAAg fded | cAAe ce a2 | 
 cAAg fded | BGGA Bcde | cAAg fded | cAAe ce a2 | ceae fdec | BGGA BcdB ||  