Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/8
M:3/4
K:G
['G2 B2 AG', 'de =f2 (gf)(ed) d2 e2 g2 g2']  
X:1
L:1/8
M:3/4
K:G
 D2 | G2 B2 AG | AB c2 BA | G2 B2 AG |{G} F4 D2 | G2 B2 AG | AB c2 (ge) | d2 cB AB | G4 :: de | 
 =f2 (gf)(ed) | d2 e2 g2 | g2 B2 (AG) | (G2 F2) D2 | G2 B2 AG | (AB) d2 (ge) | d2 cB AB | G4 :|  