Using the provided alphabet sequence and motif, develop a unique musical composition.
X:1
L:1/8
M:3/4
K:G
["GBAcBd de/f/ gfga ba/b/ c'bag", 'gb/g/ dddd e/d/c/B/ cccc B/c/B/A/']  
X:1
L:1/8
M:3/4
K:G
 GBAcBd | de/f/ gfga | ba/b/ c'bag | f/g/f/e/ d/e/d/c/ BA | GBAcBd | de/f/ gfga | ba/b/ c'bag | 
 fg/a/ a2 g2 :: gb/g/ dddd | e/d/c/B/ cccc | B/c/B/A/ GGGG | A/G/F/E/ DD D2 | gb/g/ dddd | 
 e/d/c/B/ cccc | B/c/B/A/ GABc | de/f/ a2 g2 :|  