Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/4
Q:1/4=120
M:4/4
K:Ab
['A G']  
X:1
L:1/4
Q:1/4=120
M:4/4
K:Ab
 z A G A | B c d c | B2 A2 | z B c B | A G F F | E4 | z A G A | B c d c | B2 A2 | z B c B | 
 A G F F | E3 E | B B c A | d c B2 | z e d c | B A A G | A2 |]  