Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:G
['G2 GB d<B', 'fa (3gfe (3dcB A2 ga :|2 (3bag']  
X:1
L:1/8
M:4/4
K:G
 G2 GB d<B Bc | dB ee dB AB | G2 GB d<B Bd |1 (3efg (3dcB Ac BA :|2 (3efg (3dcB A2 ga |: 
 b<g gb a<f fa | g2 gd ef ga |1 b<g gb a<f fa | (3gfe (3dcB A2 ga :|2 (3bag (3agf gf ed | 
 (3efg (3dcB Ac BA ||  