Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/8
Q:3/8=90
M:6/8
K:Bb
['Tc2 B', 'TA2 G'  
X:1
L:1/8
Q:3/8=90
M:6/8
K:Bb
 fbB Tc2 B | fbB Tc2 B | fbf gbg | fdb Tc2 B | fbB Tc2 B | fbf Tg2 f | =edc fga | gf=e f3 :| 
 FcG TA2 G | FdB TA2 G | FDF GEG | FBd Tc2 B | AfF FGA | Bcd edc | Bdf GAB | cBA B3 |]  