Develop a musical composition incorporating the given motif while adhering to the outlined alphabetical form.
X:1
L:1/8
M:4/4
K:G
['[BG] [BG]2', 'A2 fg fedc B [gB]2 f', 'A2- A2 [AG]2', 'E DFAg']  
X:1
L:1/8
M:4/4
K:G
 ef | gfga gfed | B [BG]2 [BG] [BG]2 dB | [AF] [AF]2 [AF] [AF]2 dc | B [BG]2"^a." [BG] [BG]2 ef | 
 gfga gfed | B [BG]2 [BG] [BG]2 cB | A^GAB cdef | [gB]2 [gB]f [gB]2 ::[K:D] (3(FG^G) | A2 fg fedc | 
 B [gB]2 f g3 B | ABcd ecAc | dcde f3 A- | A2 fg fedc | B [gB]2 f [gB]2 [eA]>[eA] | ABcd egfe | 
 [dF]4 [dF]2 :|"^1st part again" |: A2- | A2 [AG]2 F3 E | DFAg [fA]2 [fA]2 | Acef gf e2 | 
 defg a2 AA- | A2 [AG]2 F3 E | DFAg f2 ff | Acef gfec |1"^b" dfec d2 (3(FG^G) :|2 [dF]3 c [dF]2 |] 
[K:G]"^Var:""^a." F ||[K:D]"^b." d2 dc |]  