Construct musical melodies following the designated letter arrangement and the given motif.
X:1
L:1/8
Q:1/2=100
M:4/4
K:G
['DC B,CDB, G,B,DB, G,2 G2- G2 AG', 'G2 B>c dBGB dBGB ecAc ecAc fdBd']  
X:1
L:1/8
Q:1/2=100
M:4/4
K:G
 DC | B,CDB, G,B,DB, | G,2 G2- G2 AG | FGAF DFAF | D2 d2- d2 cB | cdec BcdB | cdef gfed | 
 gdec dBAG | D2 G2 G2 :: B>c | dBGB dBGB | ecAc ecAc | fdBd efge | f2 d2 d2 cB | cdec BcdB | 
 cdef gfed | gdec dBAG | D2 G2 G2 :|  