Develop musical compositions by respecting the prescribed structure and combining the presented musical concept.
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
['g fBdB fBgB fBdB gccg fBdB fBdB', 'BGG A BcdB ABcA BGGB A=F D2'  
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
 g | fBdB fBgB | fBdB gccg | fBdB fBdB | cedc BGG :: A | BcdB ABcA | BGGB A=F D2 | BcdB Ag^fg | 
 ecAd BGG :|  