Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/4=180
M:2/4
K:D
['d2 fa', 'dc BA GA BG A2']  
X:1
L:1/8
Q:1/4=180
M:2/4
K:D
 d2 fa | gf ec | d2 fa | g2 B2 | d2 fa | gf ed | B2 ed | c2 A2 :: dc BA | GA BG | A2 gf | g2 B2 | 
 dc BA | GA BG | A2 ed | c2 A2 :|  