Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
Q:1/4=50
M:3/4
K:Bb
['F FA B2 dB AB c3 e', 'B3 d/e/ ff f2 ed ed e2']  
X:1
L:1/8
Q:1/4=50
M:3/4
K:Bb
 F FA | B2 dB AB | c3 e dc | f2 cB A>G | F3 F FA | B2 dB AB | c3 e dc | f>e c/B/A c2 | B3 |: 
 d/e/ ff | f2 ed ed | e2 f>e dc |{B} d2 cB A>G | F3 F FA | B2 dB AB | c2- c>e de | d2 c/B/A{A} c2 | 
 B3 |]  