Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:9/8
K:Amin
['[K:F#min]|: F2 B', 'F2 B BAB', 'f2 b']  
X:1
L:1/8
M:9/8
K:Amin
[K:F#min]|: F2 B BAB BAB | F2 B BAB d2 c | F2 B BAB BAB | d2 c B2 A F2 E | F2 B BAB BAB | 
 FAB BAB dBc | F2 B BAB BAB |1 d2 c B2 A B3 :|2 d2 c{Bc} B2 A Bce |: f2 b f2 b agf | 
 e2 a e2 a gfe | f2 b f2 b agf | d'2 c' b2 a f2 e | f2 b f2 b agf | e2 a e2 a gfe | 
 f2 b f2 b agf |1 d'2 c' b2 a f2 e :|2 d'2 c' b2 a b3 ||  