Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
Q:3/8=100
M:6/8
K:F
['f>ga F2 F', 'BGB AFA', 'fed cBA']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:F
 f>ga F2 F | G>AB A2 G | f>ga F2 F | G>AB A3 :: BGB AFA | BGB A2 G | BGB AFA | BdB c3 :: fed cBA | 
 GAB AGF | fed cBA | BGE F3 :|  