Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:C
['Gc c2', 'fdcA _B2 dB FBdc BG g2 fdBd']  
X:1
L:1/8
M:4/4
K:C
 Gc c2 gc c2 | Gceg f3 c | Gc c2 GFEC | (3DEF GF DEFA | Gc c2 gc c2 | Gceg f3 e | dedc Bcdc |1 
 BGFD C3 c :|2 BGFD CDEF || c2 ec gcec | Gceg fdcA | _B2 dB FBdc | BG g2 fdBd | c2 ec Gcec | 
 Bcde f2 fe | dedc Bcdc |1 BGFD C3 B ||2 BGFD C2 cB ||  