Craft a musical composition with the supplied motif and conforming to the necessary format.
X:1
L:1/8
M:3/4
K:Bb
["de fd' bd fB A2", 'B2 z2'  
X:1
L:1/8
M:3/4
K:Bb
 de |:"Bb" fd' bd fB |"F7" A2 cd ea | g2 fA eA |"Bb" BA Bc de | fd' bd fB |"F7" A2 cd ea | 
 g2 fA eA |1"Bb" B2 z2 de :|2"Bb" B2 z2 =ef |:"Cm" c'2 gb"F7" ac' |"Bb" b3 a gf |"F7" a3 g f=e | 
"Bb" g3 f =ef |"Cm" c'2 gb"F7" ac' |"Bb" b3 a gf |"F7" ag fe cf |1"Bb" B2 z2 =ef :|2 
"Bb" B2 z2 B2 |:[K:Eb]"Eb" Bg fe dc | c2 B2 B2 |"Bb7" ga dd d2 |"Eb" ag ee e2 | Bg fe dc | 
 c2 B2 B2 |"Bb7" ga dd d2 |1"Eb" e2 z2 B2 :|2"Eb" e2 z2 z2 |]  