Compose a piece of music using the specified letter-based musical form and incorporating the assigned motif.
X:1
L:1/8
M:4/4
K:G
['', 'BG G2', 'G3 f g2 gf gB B2 eBgB', 'cdef g2 gd BG G2 FGAB c2']  
X:1
L:1/8
M:4/4
K:G
 A |: BG G2 d2 cA | BdcA BG G2 | ADFD c2 cA | BdcA BAFABG G2 d2 cA | BdcA BG G2 | FGAB cdeg | 
 fdcA G3 :: f | g2 gf gB B2 | eBgB eB B2 | dega bgag | eaag agef g2 eg f2 df | egfd edBd | 
 c2 ec BcdB | A2 AB cdef :: g2 gd BG G2 | FGAB c2 BA | GBBA B2 Bc | dBAG FDDF G2 BG F2 AF | 
 EGFD edBd | c2 ec BcdB |1 A2 AB cdef :|2 FGAc BG G2 ||  