Create a musical composition using the provided motif and the alphabet representation of the specified sequence.
X:1
L:1/8
Q:1/4=96
M:3/4
K:C
['G_B BB BB _B c-']  
X:1
L:1/8
Q:1/4=96
M:3/4
K:C
 G_B BB BB | _B c- c4 | G_B BB BB | _B c- c2 BB | _Bc c3 G | _B A- A4 | _Bc BA Bc | 
 (_B2- B/c/4B/4A/B/4A/4) G2- | G4 z2 :|  