Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:Amix
['AMa AMa', 'AMa GMa']  
X:1
L:1/8
M:4/4
K:Amix
|: AMa AMa | AMa AMa | GMa GMa | GMa GMa | AMa AMa | AMa AMa | GMa GMa | AMa AMa |: AMa AMa | 
 GMa AMa | GMa GMa | GMa GMa | AMa AMa | GMa AMa | GMa GMa | AMa AMa :|  