Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/4
M:3/4
K:F
['e c']  
X:1
L:1/4
M:3/4
K:F
 G f c | e/g/ a d | G/f/ e c | A F2 | G f c | c/f/ e c | c/f/ e c | A F2 |]  