Compose a piece using the specified musical pattern based on the alphabet notation and provided melodic motif.
X:1
L:1/8
M:2/2
K:G
['dBdg z', 'GBzB [G,D]3', 'G[GB]z[GA]{A} [GB]3 B']  
X:1
L:1/8
M:2/2
K:G
 vg2 vge dBdg | z B{c} BA{Bc} B2{Bc} B2 | vg2 vge dBdg | z B AB G4 | vg2 vge dBdg | 
 z B{c} BA{Bc} B2{Bc} B2 | gage dBdg | z B AB G3 || D | GBzB [G,D]3 B | dBBA !>!BB!>!BB | 
 GBzB [G,D]3 d | dBAB G3 D | GBzB [G,D]3 B | dBBA !>!Bz!>!BB | GBzB [G,D]3 d | dBAB G4 |]: 
"^Alternate 'B'" D | G[GB]z[GA]{A} [GB]3 B | dBBA BzBB | G[GB]z[GA]{A} [GB]3 B | dBAB G3 :|  