Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
M:4/4
K:G
['D G G/F/ G E A A2', 'F A']  
X:1
L:1/4
M:4/4
K:G
 D G G/F/ G | E A A2 | F F/G/ A F | G B B2 | D G G/F/ G | E A A2 | F F/G/ A F | G B G2 :| F A F A | 
 A G G2 | E/F/ G E/F/ G | B A A2 | F A F A | G B B2 | A F A/G/F/E/ | D F D2 :|  