Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/4
M:3/4
K:Fdor
['', 'B G', 'c B G']  
X:1
L:1/4
M:3/4
K:Fdor
 B, |: E3/2 E/ E | E G B | c3/2 c/ c |1 c B G | c3/2 c/ c | c B G | F G B | G F B, :|2 c3/2 d/ e | 
 c B G | F3 | E2 B || c3/2 c/ c | c B G | B3/2 c/ B | B c d | e d c | B G F | E3/2 E/ E | E G B | 
 c3/2 c/ c | c B G | c3/2 d/ e | c B G | F3 | E3 ||  