Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/4
M:4/4
K:G
['G G']  
X:1
L:1/4
M:4/4
K:G
 B2 A2 | G F/E/ D D | G G A d | B2 z2 | B2 A2 | G F/E/ D D | G G A d | B2 z G/A/ | B B B c/B/ | 
 A A A B/A/ | G G G A/G/ | F F F D | G G A A | B3/2 c/ d B | A2 F2 | G2 z2 |]  