Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:Bb
['Bcde fBAB bBAB GBFB EBDB']  
X:1
L:1/8
M:4/4
K:Bb
"Bb" Bcde fBAB |"Eb" gBaB"Bb" bBAB |"Bb" GBFB EBDB |"F" GecA"Eb" BAGF |"Bb" Bcde fBAB | 
"Eb" gBaB"Bb" bBAB |"Bb" GBFB EBDB |"F" GecA"Bb" B2 z2 ::"Bb" fBAB"Eb" gBAB |"Eb" gfga"Bb" bagf | 
"Bb" bagf"Eb" edcB |"Eb" cecA"F" BAGF |"Bb" Bcde fBAB |"Eb" gBaB"Bb" bBAB |"Bb" GBFB EBDB | 
"F" GecA"Bb" B2 z2 :|  