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:F
['D2 F C3']  
X:1
L:1/8
M:6/8
K:F
 C | FFA GGF | D2 F C3 | CDE FGA | B2 A G2 A | C2 C CCC | D2 F C3 | AAA cBG | F2 F FGA | C2 C CDE | 
 F2 F F2 ||  