Construct a musical composition using the provided motif and maintain the designated form.
X:1
L:1/8
M:2/2
K:G
['B [GB]2 [GB] [GB]2 [GB]2 [Gc][Gc][Gc][Gc] [Gc]2', '[Bb])a(ga) [Bb]4 a(ba)g fdef'  
X:1
L:1/8
M:2/2
K:G
 dc | B [GB]2 [GB] [GB]2 [GB]2 | [Gc][Gc][Gc][Gc] [Gc]2 ag | f [df]2 [df] [df]2 (ef | 
 g)(fa)(f g)(fe)d | B [GB]2 [GB] [GB]2 [GB]2 | [Gc][Gc][Gc][Gc] [Gc]2 ag | f [df]2 [df] [df]2 (ef | 
 g2) (a/g/f) g2 :: ([Bg]a) | [Bb]2 [Bb]4 ([B-a]2 | [Bb])a(ga) [Bb]4 | a(ba)g fdef | 
 gfga b2 ([Bb]a) | [Bb]2 [Bb]4 ([Ba]2 | [Bb])a(ga) [Bb]4 | a(ba)g fdef | [Bg]6 :|  