Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
M:4/4
K:Gdor
['^F G2', 'D D']  
X:1
L:1/4
M:4/4
K:Gdor
 B2 B B G4 | D2 D E ^F G2 ^F | G2 z ^F G A B3/2 B/ | A F G3/2 G/ | ^F z/ G/ A c | 
 B G G ^F G3/2 G/ D2 | F B3/2 A/ G A/ B A/ B z/ B/ | A ^F G3/2 =F/ D/ E/ F _E2 | 
 D2 D3/2 C/ =B,2 z G |: ^F A D G F3 C | D D G3/2 G/ ^F2 z C | C _E E B, D D D D | D C A, D |1 
 =B,2 z G :|2 =B,4 |]  