Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
Q:3/8=90
M:6/8
K:Gmin
['B2 G AFD', 'fgf fcA']  
X:1
L:1/8
Q:3/8=90
M:6/8
K:Gmin
|: A | B2 G AFD | B2 G AFD | F3- F2 A | F3- F2 A | B2 G AFD | B2 G AFD | G3- G2 B | G3- G2 :: A | 
 Bcd cBA | BAG AFD | fgf fcA | fgf fcA | Bcd cBA | BAG AFD | gag gdB | gag g2 A | Bcd cBA | 
 BAG AFD | fgf fcA | fgf fcA | Bcd cde | dcB AG^F | G3- G2 B | G3- G2 :|  