Develop a musical composition by utilizing the given alphabetic notation and supplied motif.
X:1
L:1/4
Q:3/4=70
M:6/4
K:Gmin
['c2 =B c G2 e c2 g2', 'g f2']  
X:1
L:1/4
Q:3/4=70
M:6/4
K:Gmin
 c2 =B c G2 | e c2 g2 f | e d2 c2 G | =B c2 g3 :: b2 a b f2 | g d2 e2 f | g f2 B A2 | B3 f3 | 
 g3/2 a/ g f2 d | e3/2 f/ e d2 =B | c3/2 d/ c G =B2 | c3 g3 :|  