Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:4/4
K:Dmix
['AB B2', 'AGdG G/A/Bd =f3 e dg g2 abag']  
X:1
L:1/8
M:4/4
K:Dmix
 gfdc AB B2 | dc c2 AB B2 | gfdc AB B2 | d2 cA AG G2 | gfdc AB B2 | dc c2 AB B2 | dc c2 AB B2 | 
 d2 cA AGdG || G/A/Bd =f3 e | dg g2 abag | gfdc ABcA | d2 cA AGdG | G/A/Bd =f3 e | dg g2 abag | 
 gfdc ABcA | B/c/dcA AG G2 ||  