Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:F
['', 'DE F6 DE', 'F6 AG F6']  
X:1
L:1/8
M:4/4
K:F
 FG |: A6 GF | G6 EF | G4 c3 E | E2 F4 DE | F6 DE | F6 DE | F3 E F3 G |1{AB} A2 G4 FG :|2 
{BA} A2 G4 ED |: C4 c2 BA | F6 DC | C4 c2 BA | F6 AG | F6 AG | F6 DE | F3 E F3 G |{AB} A2 G4 ED :|  