Craft melodious tunes in accordance with the outlined letter representation and the provided thematic element.
X:1
L:1/8
M:2/4
K:C
['C GGAA GGEF G2 A2 G2 z']  
X:1
L:1/8
M:2/4
K:C
 C | GGAA | GGEF | G2 A2 | G2 z C | GGGG | cGEF | G2 G2 | C2 z |]  