Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:4/4
K:C
['B,E E2', 'eB B2 ^gB B2'  
X:1
L:1/8
M:4/4
K:C
|: D2 | B,E E2 B,E^GE | B,E^GA _BAFD | B,E E2 B,E^GA | _BAFD E2 ED | B,E E2 B,E^GE | B,E^GA _BAFD | 
 FE E2 ^GE E2 | _BAFD E2 :: d2 | eB B2 ^gB B2 | (3cBA eA fAeA | eB B2 ^gB B2 | _b3 a g^f=fe | 
 eB B2 ^gB B2 | (3cBA eA fAeA | B^G G2 AF F2 | BA^GF E2 :|  