Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/16
Q:1/8=180
M:2/4
K:D
['ee2c d2cd', 'a2ga ba2b a2ef gafd']  
X:1
L:1/16
Q:1/8=180
M:2/4
K:D
|: AG | EA2B A2cd | ee2c d2cd | ea2a g2ag | da2a g2ag | edB(B A2)cd | ee2c d2cd | ea2b gedB | A6 :: 
 cd | ea2b a2ga | ba2b a2ef | gafd ea2a | gafd ecBA | Aeab a2ga | ba2b a2ef | gafd efdB | A6 :|  