Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/2
K:G
['BGDC B,CDC', 'FDEF G2', 'FDEF G2']  
X:1
L:1/8
M:2/2
K:G
 BG G2 BGAc | BGDC B,CDC | B,G,B,D ECEG | FDEF GFGA | BGGF G3 A | BGDC B,CDC | B,3 D E3 G |1 
 FDEF G2 GA :|2 FDEF G2 ga |: bg g2 egde | cdBc ABGA | FGEF DECD | B,CA,B, G,A,B,D | GABc dBGB | 
 ABcA BGDC | B,G,B,D ECEG |1 FDEF G2 ga :|2 FDEF G2 GA |:"^variations" BGGF G3 c | BGDC B,EDC | 
 B,G,B,D E3 G | FDAF GFGA | BGGF G3 A | B2 dB BAGD | B,3 D E2 CE |1 FDEF G2 GA :|2 FDEF G2 ga |: 
 bg g2 egdg | caBg AfGe | FdEc DBCA | B,GA,F G,A,B,D | GABc dBGB | ABcA BGDC | B,G,B,D ECEG |1 
 FDEF G2 ga :|2 FDEF G2 GA ||  