Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
Q:1/8=100
M:4/4
K:G
['cBAG g3 a b2 ag gfed', 'g2 ef gfed d2 b2 afef d2']  
X:1
L:1/8
Q:1/8=100
M:4/4
K:G
"^moderate" AB | cBAG g3 a | b2 ag gfed | e3 d BABd | e2 fg g2 dc | cBAG g3 a | b2 ag gfed | 
 efga bagf | e3 f g2 || ef | gfed d2 b2 | afef d2 Bc | d3 e dedB | d3 e/f/ g3 f | edeg e2 dB | 
 dBde/f/ g3 a | bage de/f/gc | B3 A G2 |]  