Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/16
M:2/4
K:D
['d4 defg a2f2 d4 e2e2', 'efed c2A2', 'f4 agfg']  
X:1
L:1/16
M:2/4
K:D
 A2 | d4 defg | a2f2 d4 | e2e2 A2c2 | dcde d2A2 | d4 defg | a2f2 d4 | e2e2 A2c2 | d2d2d2 :: e2 | 
 efed c2A2 | d2f2e2a2 | efed c2A2 | d2f2 e4 | efed c2A2 | d2f2e2a2 | agfe dcBA | B2c2d2 :: 
 f4 agfg | f4 agfg | f2g2a2b2 | a2gf e4 | f4 agfg | f4 agfg | f2d2e2c2 | d4 d4 d4 :|  