Construct a musical piece using the designated motif and sticking to the alphabetical form presented.
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
['B2 AG ^F2']  
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
 D2 | G2 GA B2 AG | ^F2 GA G2 GG | (=FG)FE (DF)Bc | d2 cB c2 F2 | dd(Bd) c2 Ac | B2 AG ^F2 D2 | 
 E2 =FG D2 GA | B2 A>G G2 ||  