Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
Q:1/4=130
M:2/4
K:G
['GB dg dBBg dBBg d2 B2 GBdg', 'ecdB GBdB d2 B2 GBdB ecdB cAAB', 'B2 gdGd BGdB gAAB B2 B2 GBBB', 'B>BB>B cAAB c2']  
X:1
L:1/8
Q:1/4=130
M:2/4
K:G
 GB dg | dBBg | dBBg |"^tr" d2 B2 | GBdg | dBBg | aAAB |"^tr" c2 c2 :: GBdB | ecdB | GBdB | 
"^tr" d2 B2 | GBdB | ecdB | cAAB |"^tr" c2 B2 :: gdBd | BGdB | gdBc |"^tr" d2 B2 | gdGd | BGdB | 
 gAAB |"^tr" B2 B2 :: GBBB | BBBB | GBBB |"^tr" d2 B2 | GBBB | B>BB>B | cAAB | c2 B2 :|  