Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:4/4
K:D
['fedB A2 FA BAGB AF D z', 'fded B2 BA']  
X:1
L:1/8
M:4/4
K:D
 fedB A2 FA | BAGB AF D z | fedB AGFG | Eeed efge | fedB Adcd | BAGB ADFA | BcdB cdeg |1 
 fgec d2 de :|2 fgec d3 e || fgag fgag | f3 g fded | B2 BA Bcdc | Beed efge | fdfa g2 ag | 
 f2 eg fded | B2 BA Bcdg |1 fgec d2 de :|2 fgec d4 ||  