Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:6/8
K:Bb
['B def fg=e f3 z2 _e d2', 'z2 d e2 e edc egg g2'  
X:1
L:1/8
M:6/8
K:Bb
"^Rather Slow" B | def fg=e | f3 z2 _e | d2 f fdB | A2 z z2 G | g>ag g2 d | (efe){e} d2 c | 
 c4 z2 :: d | e2 e edc | egg g2 (D | E)FG FDB, | CDE G,2 (e | dcB) c2 c | AGF F2 F | GAB BcA | 
 B3 (d/e/ f2) | dcB FBA | B4 z2 :|  