Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/4
M:6/4
K:A
['c B2', 'd c'  
X:1
L:1/4
M:6/4
K:A
 A2 A A2 a | g2 f e2 a | g2 f e f g | f a c B2 c | B2 A G A | B3 B d c | B2 A G2 A | (B3 B2) c | 
 d2 d d e f | d f e c2 B | c2 c c d e | (f e) d/c/ B c d | e2 z G2 z | F2 G A d c | B A G F2 E | 
 (E3 E2) || E | B2 B B c A | (G3 G2) B | e2 e e3/2 f/ e/d/ | (c3 c2) c | f2 g/a/ a g f | 
 ^e2 c f2 g | a g f c f ^e | (f3 f2) g | a2 a a3/2 b/ a/g/ | f2 f f2 e | d f d c e c | (B3 B2) c | 
 B2 A G2 A | (B3 B2) c | d f d c d c | B a g f b f | e d c B2 A | (A3 A3) ||  