Construct a piece of music by converting the stated musical sequence into an alphabetical format and integrating the supplied motif.
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
['BG-GB cA-Ac', 'G4 gb-bg fa-af eg-ge f2 d2 ce-ec']  
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
 BG-GB cA-Ac | BG-GB c2 A2 | BG-GB cA-Ac | BGAF G4 :: gb-bg fa-af | eg-ge f2 d2 | ce-ec Bd-dB | 
 cAGF G4 :|  