Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/8=150
M:2/2
K:G
['dc BABG GBdg fdcB cedc BABG', 'dBGB dcBA G2 AB cAFA cAFA cBAG', 'cedc BABG']  
X:1
L:1/8
Q:1/8=150
M:2/2
K:G
 dc | BABG GBdg | fdcB cedc | BABG FGAB | c2 A2 A2 dc |"^5" BABG GBdg | fdcB cedc | BABG FGAc | 
 B2 G2 G2 :| Bc |"^9" dBGB dBGB | dcBA G2 AB | cAFA cAFA | cBAG F2 BA |"^13" GABc d2 g2 | 
 fdcB cedc | BABG FGAc | B2 G2 G2 :| Bc |"^17" dggf gabg | afd^c d2 de | =fede ^fgaf | gfdB cedc | 
"^21" BABG GBdg | fdcB cedc | BABG FGAc | B2 G2 G2 :|  