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