Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
['fgfe fdBc', 'FE FABc']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
 de | fgfe fdBc | defg afba | fgfe fdBd | cdec d2 de | fgfe fdBc | defg a2 bg | fgfe fdBc | 
 dfec d2 || FE | FABc d2 cd | Bedc BAFD | FABc dcdf | ecAc B2 FE | FABc dcde | fedc dcBA | 
 BGFE FDBG | FEDC D4 |]  