Develop a musical composition that includes the supplied motif while following the designated alphabetical pattern.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
['GAB BAG', 'd2 B cde edc BAG d2 c']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 D | GAB BAG | FGA AFD | GAB BAG | Bdd d2 :: B | cde edc | BAG d2 c | BAG Adc | BGG G2 :|  