Compose a piece using the alphabetic notation of the assigned musical structure and the provided melodic motif.
X:1
L:1/8
M:6/8
K:Bb
['DBB dBB ecc c2 d efg GAB', 'B3 def fgf bab fed efg fdB', 'B3 DFB DFB dBF FED E/F/GE DB,D', 'b>ab b>ab fdB']  
X:1
L:1/8
M:6/8
K:Bb
 DBB dBB | ecc c2 d | efg GAB | cdB AGF | B,BB dBB | Ccc c2 g | fed cde | dBB B3 :: def fgf | 
 bab fed | efg fdB | ecc c3 | def fga | bag fed | ede cfe | dBB B3 :: DFB DFB | dBF FED | 
 E/F/GE DB,D | ECC C3 | DEF GAB | cde fga | bfd cfe | dBB B3 ::"^tr" b>ab"^tr" b>ab | 
"^tr" b>ab fdB | (e/f/ge) (d/e/fd) | ecc c3 |"^tr" b>ab"^tr" b>ab |"^tr" b>ab fdB | 
 (d/e/fd) (c/d/ec) | dBB B3 :|  