Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:C
['BEA |[M:6/8][K:C]SOSOO .!fermata!PMTuCO(Mg/f/)', 'cBA eAA', 'a^ga cBA']  
X:1
L:1/8
M:4/4
K:C
 BEA |[M:6/8][K:C]SOSOO .!fermata!PMTuCO(Mg/f/) |: eAA cBA | eAA ^f^ga | eAA c2 e | dBG Bcd | 
 eAA cBA | eAA B2 A | GBG g^fg | dBG Bcd :: cBA a^ga | cBA Bcd | cBA g^fg | dBG Bcd | cBA a^ga | 
 cBA B2 A | GBG g^fg | dBG Bcd :|  