Develop a musical composition by utilizing the given alphabetic notation and supplied motif.
X:1
L:1/8
M:3/4
K:G
['(B2 A2 G2)', 'G2 GA B2 c2', 'G4 variation of', '(B2 A2']  
X:1
L:1/8
M:3/4
K:G
|: GA | (B2 A2 G2) | B4 BB | (B2 A2 G2) | d4 dd | (cB AB cA) | (BAGA BG) | (AG FG AB) | G4 :: G2 | 
 GA B2 c2 | d4 e2 | c4 d2 | B2 BA G2 | GA B2 c2 | d2 (DEFG) | A2 (AG AB) | G4 :| 
"^slight variation of first part" |: GA | (B2 A2 G2) | B4 Bc | (B2 A2 G^c) | d4 dd | (cB AB cA) | 
 (BAGA BG) | (AG FG AB) | G4 :|  