Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:2/4
K:C
['B B']  
X:1
L:1/8
M:2/4
K:C
 F | FAAF | EGG F | FAAG | A3 F | FAAG | F(ED)C | DFFF | E3 D/C/ | FC C2 | D>CD>E F2 | FAGA | 
 F2 x2 |[M:4/4][K:G][K:treble] D | G B B B | G B B B | G B B A | B3 B | B B B A | G F E E | 
 A A A G | F2 E F | G D/D/ D2 | E/D/ E/F/ G2 | G A/B/ c B | G2 x2 |]  