Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/16
M:2/4
K:D
["d2f2 A2a2 A2d'2 A2a2 Acec Aceg", 'd2 e2 f4 f2>e2 f2a2 agf2 g4', "d'2f2 afd2 c2B2 B2>d2 c2A2 Bcde", 'ABcd efga b2a^g a4 ABcd']  
X:1
L:1/16
M:2/4
K:D
 (3ABc | d2f2 A2a2 | A2d'2 A2a2 | Acec Aceg | f2d2 dcBc | d2f2 A2a2 | A2d'2 A2a2 | Acec Aceg | 
 f2d2 d2 :: e2 | f4 f2>e2 | f2a2 agf2 | g4 g2>a2 | bagf a2g2 | f2>e2 f2fg | agfa g2 (3efg | 
 a2d2 fedc | e2d2 d2 :: (3abc' | d'2f2 afd2 | c2B2 B2>d2 | c2A2 Bcde | d2f2 a2 (3dfa | d'2f2 afd2 | 
 c2B2 B2>d2 | c2A2 Bcde | f2d2 d2 :: z2 | ABcd efga | b2a^g a4 | ABcd efg2 | afd2 afd2 | 
 ABcd efga | b2a^g a4 | ABcd efge | f2d2 d2 :|  