Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:G
['B3 GBd', 'f3 fed cAG FGA', 'gdB gdB ecA ecA']  
X:1
L:1/8
M:6/8
K:G
 A | B3 GBd | cBc ABc | B3 GBd | cAG FGA | B3 GBd | cBc ABc | df/e/d cAF | AGF G2 :| d | f3 fed | 
 cAG FGA | dgg gfg | afd d2 e | f3 fed | cAG FGA | B/c/dB cAF | AGF G2 :| f | gdB gdB | ecA ecA | 
 B3 GBd | cAG FGA | gdB gdB | ecA ecA | B/c/dB cAF | AGF G2 :|  