Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:G
['(E/F/) (G>AB) (BAB) G3 (E2 F) (G>AB)', '(DB,).D (DB,).D']  
X:1
L:1/8
M:6/8
K:G
 (E/F/) | (G>AB) (BAB) | G3 (E2 F) | (G>AB) (dBG) | (A3 A2) (B/d/) | e2 (e d2) (d | c2) (c B)(AG) | 
{c} (BAB GED) | (E2 F) G2 || (F/E/) | (DB,).D (DB,).D | G3 G2 z | (DB,).D (DB,).D | A3 A2 z | 
 e2 (e d)(ed | c2) (c B)AG |{c} (BAB GED) | (E2 F) G2 ||  