Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:2/4
K:D
['f2 e2 d2 A2 Agfe']  
X:1
L:1/8
M:2/4
K:D
 f2 e2 | d2 A2 | Agfe | df a2 | f2 e2 | d2 A2 | Agfe | d2"^1)" z2 | fAfA | fa a2 | eAeA | eg g2 | 
 fAfA | (fa) a2 | bgec | d2 x2 :|  