Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:9/8
K:F
['vA2 vF uc2 uA fga uA2 uF', 'edc vcdc uf2 uc fga ucdc vf2']  
X:1
L:1/8
M:9/8
K:F
|: vA2 vF uc2 uA fga | uA2 uF vc2 vA BAG | vA2 F c2 A fga | ub2 a g2 f edc :: vcdc uf2 uc fga | 
 ucdc vf2 vc BAG | vcdc f2 c fga | ub2 a g2 f edc :|  