Develop a musical composition by utilizing the given alphabetic notation and supplied motif.
X:1
L:1/4
M:4/4
K:Gmix
['D G']  
X:1
L:1/4
M:4/4
K:Gmix
 D | G D G A | B B A/G/ E/S D/ | G2 A2 | G3S B | d B d e | B B A/G/S E/D/ | G G A B/A/ | G3 z |]  