Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:6/8
K:G
['(A2 F)', 'f)dc (B2 G) (A2 F) GFD FGA', '(B/c/d)(e f)df']  
X:1
L:1/8
M:6/8
K:G
 A | (B2 G) (A2 F) | GFD FGA | BAG (A2 F) | G2 (g f)dc || (B2 G) (A2 F) | GFD FGA | BAG FD(F | 
 G3) G2 :: A | (B/c/d)(e f)df | gag fdc | (B/c/d)(e f)df | Tg3 ([Gg]2 [Aa]) |1 (B/c/d)(e f)df | 
 gag fdc | BAG FD(F | G3) G2 :|2 bag ga(g | f)dB (cd)e | fed cA(F | G3) G2 |]  