Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=120
M:2/4
K:Bb
['B2 BABc B2 cc d2 cc']  
X:1
L:1/8
Q:1/4=120
M:2/4
K:Bb
 B2 | BABc | B2 cc | d2 cc | FF B2 | BABc | B2 cc | d2 cc | B2 ||  