Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:G
['B>GB>d g>dB>G', 'G2 (3ABc d>c (3cBA G>Bd>=f e2 c2']  
X:1
L:1/8
M:4/4
K:G
|: d>c | B>GB>d g>dB>G | A>ca>g f>ed>c | B>GB>d g>dB>G | (3ABG (3FGE D>d^c>d | B2 (3Bcd g>dB>G | 
 A2 a>g (3fed c>A | B>dB>G (3cBA F>A | G2 (3GGG G2 :: (3ABc | d>c (3cBA G>Bd>=f | e2 c2 c2 (3Bcd | 
 e>d^c>B A>ce>g | f2 d2 d2 (3def | g2 (3gge f2 (3ffd | e>c (3gfe d>cB>A | (3BdB G2 (3AcA (3FGA | 
 G2 G>F G2 :|  