Develop a musical piece using the given motif and adhere to the outlined musical structure.
X:1
L:1/4
M:6/4
K:B
['f d3/2 c/ B c A F', 'g a'  
X:1
L:1/4
M:6/4
K:B
 f | d3/2 c/ B c A F | B3- B2 f | d3/2 c/ B c A F | e3- e2 b | a3/2 b/ g f2 g | e3/2 f/ d c2 B | 
 A2 f G =e2 | f3- f2 :: c | A3/2 B/ c G2 F | d3/2 e/ f c2 B | g a b f g a | e3 d2 a/g/ | 
 ^f d g =e2 c | f d e c2 d/c/ | B G c A F3/2 d/ | c3 B2 |]  