Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:4/4
K:C
['e>A (3AAA (eA)ce', 'Aceg a2']  
X:1
L:1/8
M:4/4
K:C
[M:2/2][K:A] .abc e>A (3AAA (eA)ce | eaec BABc | e>A (3AAA (eA)ce ||1 faec BAFE :|2 faec B2 A2 || 
 Aceg a2 (ag) | faec BAFE | Aceg a2 (ae) | gbeg afec | Aceg a2 (ae) | faec BAFE | Aceg a2 (ge) | 
 fefg agaf |]  