Create a musical composition using the given alphabetical pattern and melodic theme.
X:1
L:1/8
M:2/4
K:G
['BD BD B/A/B/c/ e d', 'fg/f/ ef/e/ dD D/F/A/d/ cE E/G/B/c/ dd', 'BA ff/f/ gf ee/e/ fe']  
X:1
L:1/8
M:2/4
K:G
|: BD BD | B/A/B/c/ e d | cA FD | G/D/E/F/ G/A/B/c/ | BD BD | B/A/B/c/ e d | cAFD | GB G2 :: 
[K:D] fg/f/ ef/e/ | dD D/F/A/d/ | cE E/G/B/c/ | dd d2 | fg/f/ ef/e/ | dD D/F/A/d/ | cE E/G/B/c/ | 
 dd d2 ::[K:D] AA/A/ BA | ff/f/ gf | ee/e/ fe | dd e/d/c/B/ | AA/A/ BA | ff/f/ gf | ee/e/ fe |1 
 df d2 :|  