Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:D
['e_e ef g2 e2 de dc B2', 'FG FE Fd cd B2 _B2 _BA', 'e3 f g2 g2 f2 d2 c2', 'A2 BA']  
X:1
L:1/8
M:2/4
K:D
 e_e ef | g2 e2 | de dc | B2 f2 | FG FE | F2 ^G_B | B4 | B4 |: FG FE | Fd cd | B2 _B2 | _BA B2 | 
 f2 c2 | e2 dc | d2 BA | Bc dB | FG FE | Fd cd | B2 _B2 | _BA B2 | f2 c2 | e2 dc | B2 d2 | B4 :: 
 e3 f | g2 g2 | f2 d2 | c2 B2 | cF _Bc | fe c_B | B_B Bc | d2 cd | e3 f | g2 g2 | f2 d2 | c2 B2 | 
 cF _Bc | fe dc | B2 d2 | B4 :: A2 BA | GF GA | B2 A2 | A3 A | BA ^GA | gA ^GA | BA GA | fA GA | 
 A2 BA | GF GA | B2 A2 | A4 | A2 BA | GA Bc | dB AF | D4 :|  