Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:F
['dc c2', 'ee dc B2 Bd dd cB']  
X:1
L:1/8
M:2/4
K:F
|:"^in F:""F"{e} dc c2 | dc c2 |"C7"{f} ed cB |"F" AG F2 ::"Dm" DA AA |"Gm" GF E2 |"A7" EG GG | 
"Dm" FE D2 ::[K:C]"^in C:""C"{b} ag g2 | ag g2 |"G7"{c'} ba gf |"C" ed c2 ::"Am" Ae ee | 
"Dm" dc B2 |"E7" Bd dd |"Am" cB A2 :|  