Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:D
['G FG Ac d2 AF E/E/E BA', 'fdec dAGF E/E/E (BA)']  
X:1
L:1/8
M:4/4
K:D
 G | FG Ac d2 AF | E/E/E BA B(EE)G | (FG) (Ac) d2 (AF) | D/D/D (AF) ADD :| g | fdec dAGF | 
 E/E/E (BA) BEEg | fdec dBAF | D/D/D (AF) A(DD)g | fdec dAGF | E/E/E (BA) B(EE)g | fa gb af ge | 
 fdec dBA ||  