Utilize the alphabetic system of the specified musical pattern and the supplied melodic theme to create a piece of music.
X:1
L:1/8
Q:1/8=250
M:2/4
K:G
['Bd AB', 'g2 g2']  
X:1
L:1/8
Q:1/8=250
M:2/4
K:G
"^Polka" Bd AB | GE D2 | ED EG | A2 A2 | Bd AB | G/A/G/E/ D2 |1 ED EF | G3 A :|2 ED BA | G2 G2 || 
 Bd d/^c/d | gd d/^c/d | f3 e | AB c2 | e3 d | GA B2 |1 e2 f/e/f | g2 g2 :|2 e3 f | g2 g2 |] 
"^last time" gb g z |]  