Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:C
['BG^FG DGFG', 'Ggg^f gag=f']  
X:1
L:1/8
M:4/4
K:C
[M:2/2][K:Gmin] .abc(dc) | BG^FG DGFG | AF (3FFF AFcF | BG^FG DGFG | cAfA Bcdc | BG^FG DGFG | 
 AF (3FFF AFcF | BG^FG DGFG | cAfA G2 G2 || | Ggg^f gag=f | dfaf ec (3cBA | Ggg^f gag=f | 
 cAfA G2 G2 | (3gab (3fga gafg | dfcf ec (3cBA | (3BAG (3cBA (3Bcd (3=e^fg | 
 (3fed (3cBA G2"_D.C." |]  