Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/4
Q:3/4=90
M:6/4
K:G
['(B d2)', '^c d e f g a f']  
X:1
L:1/4
Q:3/4=90
M:6/4
K:G
 e/f/ | g G2 B2 c | d D2 F2 G | (A c2) (B d2) |1 A3 G2 :|2 A3 G3 |: (B d2) g2 B | (c e2) a2 ^c | 
 d e f g a f | e3 d2 (e/f/) | (g/f/)(e/d/) g d2 c | B c/B/A/G/ F2 G | (A c2) (B d2) | A3 G3 |]  