Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
Q:3/8=60
M:6/8
K:G
['d3 d3 dBg dBG', 'dBc dBc dBg dBG']  
X:1
L:1/8
Q:3/8=60
M:6/8
K:G
"^Slow" z | d3 d3 | dBg dBG | c3 c3 | cAB cBA | d3 d3 | dBg dBG | EGc BcA | G3 z2 :| d | dBc dBc | 
 dBg dBG | cAB cAB | cAB cBA | dBc dBc | dBg dBG | EGc BcA | G3 z2 :|  