Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
Q:1/2=100
M:2/2
K:F
['F3 G A2 c2']  
X:1
L:1/8
Q:1/2=100
M:2/2
K:F
|: F3 G A2 c2 | f4 e2 d2 | f4 e2 d2 | (ef g2) g2 a2 | F3 G A2 c2 | f3 g a2 g2 | f2 d2 c2 (BA) | 
 G4 d4 |:  