Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['Bcde fdBd', 'dg bgdg']  
X:1
L:1/8
M:4/4
K:G
 G2 DG Bc{d}cA | GzD=F{G} =FDCD | G3 A Bcde | fdBd cABc | dg g2 dc c2 | Bcde fdBd | (3gag dg fdcA | 
 FGAF G2 (3.E.D.C | B,DGA BcdA | G=FDF{G} =FDCA | G2 (3.D.D.D Bcde | fdBd cABc | dg g2 dc c2 | 
 Bcde fdBd | (3gag dc BcdB | cAFA G2 Bd |: (3gag dg bgdg | (3.g.a.g dg fdBd | (3.g.a.g dg bgdg | 
 fdcA BGBd |{a} gedc BG G2 | FGAc{d} cABc | dg g2 defd | cAFA G4 :|  