Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:2/4
K:Bb
['BG FG/F/ DF GF/G/', 'dc/d/ fd']  
X:1
L:1/8
M:2/4
K:Bb
 F/G/A/ | B>A BG | FG/F/ DF | GF/G/ BA | G2 FG/A/ | BA/c/ BG | FG/F/ DF | GF/G/ BB | B3 || B/c/ | 
 dc/d/ fd | c>d cB/c/ | dc/d/ fd | c3 d/c/ | BG/A/ BG | FG/F/ DF | GF/G/ BB | B3 ||  