Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Ador
['Beed BAGA', 'BE E2']  
X:1
L:1/8
M:4/4
K:Ador
 GA | Beed BAGA | Bdef g3 z | Beed BAGA | BGdB A2 GA | Beed BAGA | Bdef g3 a | bgaf gfed | 
 efdB A2 || GA | BE E2 DEGA | BE E2 d2 BA | BE E2 DEGA | BGdB A2 GA | BE E2 DEGA | BE E2 d2 BA | 
 BE E2 DEGA | BGdB A2 ||  