Compose a music piece that includes the specified motif while adhering to the outlined alphabetical sequence.
X:1
L:1/8
M:9/8
K:G
['g dBG AGA dBg dBG', 'gfg agf', 'B2 g G2 g TB2 g AAg', 'B2 f gGg fed TedB gBg ada']  
X:1
L:1/8
M:9/8
K:G
"_Moderately" g | dBG AGA dBg | dBG AGA B2 :: f | gfg agf edB | gfg afd g2 d | gfg agf efg | 
 dBG TAGA B2 :: g | G2 g TB2 g AAg | GgG TAGA B2 :: f | gGg fed TedB | gBg ada b2 a | 
 (g/a/b)a gfg efg | GgG TAGA B2 :|  