Create a musical composition incorporating the given motif following the designated alphabetical pattern.
X:1
L:1/4
M:3/2
K:G
['_B4 c2']  
X:1
L:1/4
M:3/2
K:G
 G2 | _B4 c2 | d4 =f2 | e2 d4 | c4 c2 | d4 d2 | _B2 G2 d2 | c3 _B/A/ G2 | =F4 F2 | _B4 c2 | 
 d2 _B2 d2 | c3 _B A2 | G2 c2 B2 | A G A4 | G4 |]  