Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:6/8
K:D
['[FA]2 [EA] [FA]2', '[DA]2 [Dd] [Dd]2']  
X:1
L:1/8
M:6/8
K:D
 (B/A/) | [FA]2 [FA] [FA]2 [EA] | [FA]2 [EA] [FA]2 B | [DA]2 [FA] ([FA][EA])[DA] | 
 [EA]2 [DA] [FA]2 [FA] | [DA]2 [FA] [EA]2 [DA] | [Dd]2 e f2 (g/f/) | ecA (Bd)[FA] | 
 [FA]2 [EA] [DA]2 :: [DA]2 [Dd] [Dd]2 f | e2 [Dd] z2 [DA] | [DA]2 [Dd] [Dd]2 [FA] | 
 [EA]2 [DA] [FA]2 [DA] | [DA]2 [Dd] [Dd]2 f | e2 [Dd] f2 (gf) | ecA (Bd)[FA] | [FA]2 [EA] [DA]2 :|  