Craft a musical composition that incorporates the supplied alphabet sequence and motif.
X:1
L:1/8
M:4/4
K:Gmin
['', 'G,D GB A2']  
X:1
L:1/8
M:4/4
K:Gmin
 G,- |: G,D GB A2 GF | D2 CD FD CD | G,D GB A2 (3GAB |1 c2 Ac BA GF :|2 c2 Ac BA GA |]: 
 B2 AB GB (3BBB | AB GF DF GA | B2 AB GF DB, |1 C B,2 C DF GA :|2 C B,2 C DG z ||  