Develop a musical composition adhering to the outlined linguistic framework.
'Binary', 'Sectional: Verse/Chorus'  
X:1
L:1/8
M:12/8
K:Bb
 z | [B,,,B,,]3 [F,,F,]3 [B,,,B,,]3 [D,,D,]2 [_D,,_D,] | 
 [C,,C,]3 [F,,F,]3 [B,,,B,,]3 [B,,,B,,][C,,C,][D,,D,] | [E,,E,]3 [E,,E,]3 [C,,C,]3 [E,,E,]3 | 
 [F,,F,]6 [F,,F,]3 F,2 z | [B,,,B,,]3 [F,,F,]3 [B,,,B,,]3 [D,,D,]2 [_D,,_D,] | 
 [C,,C,]3 [F,,F,]3 [D,,D,]6 | [E,,E,]3 [E,,E,]3 [F,,F,]3 [F,,F,]3 | 
 [C,G,]3 [C,,C,]3 [F,,F,]3 [F,,F,]3 ||[K:Bb][M:6/8] [B,,F,]3 [B,,F,][B,,F,][B,,F,] | 
 [C,F,]2 [C,G,] [F,,F,A,]3 | [F,A,]3 [F,A,] G, F, | [B,,F,]2 [F,A,] [B,,F,B,]3 | 
 [B,,F,][B,,B,][B,,B,][B,,B,][C,A,][D,B,] | [E,E][E,C][E,B,][D,G,][D,B,][E,C] | [F,D]3 [F,,F,C]3 | 
 [B,,D]6 |]  