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:C
['(3G/A/B/ c2 G GEG A2 G GAB', 'gag ece']  
X:1
L:1/8
M:6/8
K:C
 (3G/A/B/ | c2 G GEG | A2 G GAB | cBc dcd | e2 c cde | fgf efe | ded BGB | cBA EFG | A2 G G2 :| 
 e/f/ | gag ece | gag ece | gag ece | Tf2 d def | g2 e f2 d | e2 c d2 B | cBA EFG | TA2 G G2 e/f/ | 
 gc'g ece | gc'g ece | gc'g ece | Tf2 d def | geg fdf | ece dBd | cBA GEG | A2 G G2 ||  