Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:Gb
['B,>D (3B,A,G, B,>D (3B,A,D B,4 E,2 E,2']  
X:1
L:1/8
M:2/4
K:Gb
 B,>D (3B,A,G, | B,>D (3B,A,D | B,4 | E,2 E,2 | B,>B, (3B,A,G, | (3A,G,F, (3G,A,G, | G,4 | 
 E,<B,, B,,2 |]  