Create a musical composition using the given alphabetical pattern and melodic theme.
X:1
L:1/4
M:4/4
K:C
['G A/F/ G2 A B/c/', 'B A']  
X:1
L:1/4
M:4/4
K:C
 G A/F/ G2 | A B/c/ B A | G A/F/ G2 | A B/c/ A2 :|[M:3/4] A B c | d e d | c B A | G2 F | D G G | 
 F G A | B A F | G3 :|  