Craft a musical composition that incorporates the supplied alphabet sequence and motif.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
['GBe dBG']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 GBe dBG | B2 B B2 A | GBe dBG | ABA A2 B | GBe dBG | B2 d g2 a | bag fed | B2 B B3 |:  