Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/2
K:G
['DTG- G2', 'A2 (Bd)']  
X:1
L:1/8
M:2/2
K:G
 (dc) | BGAF DTG- G2 | (3(Bcd) e(f ge)dc | BTG- G2 DTG- G2 | B(edB) A2 (dc) | BGAF DTG- G2 | 
 B(def) Tg3 a | bga(f gf)ed | (3(efg) (dB) A2 || (Bd) | e2 (ef) edBA | (3(Bcd) e(f ge)dc | 
 BTG- G2 DTG- G2 | B(edB) A2 (Bd) | ede(f ed)BA | (3(Bcd) ef Tg3 a | bga(f gf)ed | 
 (3(efg) (dB) A2 |]  