Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:3/4
K:C
['GEcAGA G2 F2 E2 GcAF E2 D2']  
X:1
L:1/8
M:3/4
K:C
 GEcAGA | G2 F2 E2 | GcAF | E2 D2 | C2 z2 GEcAGA | G2 F2 E2 | GcAF | E2 D2 | C2 z2 DE | F2 D2 EF | 
 G2 E2 DE | F2 D2 EF | G2 E2 z2 | GEcAGA | G2 F2 E2 | GcAF | E2 D2 | C2 z2 |]  