Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
Q:1/2=90
M:2/2
K:C
['DB,DF BFDF egec BAGF', 'fe dBfd g3 a bfdB gfdB AFcA']  
X:1
L:1/8
Q:1/2=90
M:2/2
K:C
 C |[K:Bb]"^1812" bace f eS MFE | DB,DF BFDF | egec BAGF | AFcA ecdB | Ac F2 F2 FE | DB,DF BFDF | 
 egec BAGF | Bgec dBcA | B2 B2 B2 :: fe | dBfd g3 a | bfdB gfdB | AFcA ecdB | Ac F2 F2 E2 | 
 DBGB GBEB | Acec BAGF | Ggec dBcA | B2 B2 B2 :|  