Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
M:4/4
K:G
['', 'ag e2 dB GABd edBd ea a2', 'a2 ba', 'E2 GA']  
X:1
L:1/8
M:4/4
K:G
 ag |: e2 dB GABd | edBd ea a2 | edBA G2 GA | BcBA GE D2 :| edef geeg | a2 ba gedB | edef g2 ef | 
 a2 ed BABd | edef g2 eg | a2 ba geef | gaba geef | gedB A2 || GA | BdAG E2 GA | BABd efge | 
 dBAG E2 GA | BcBA GE D2 | BdAG E2 GA | BABd efge | dBAG E2 GA | BcBA GEEd ||  