Develop musical compositions in alignment with the designated form and the offered musical notion.
X:1
L:1/8
M:2/4
K:D
['Bc dc dB D2 GE B,E', 'GE B,E'  
X:1
L:1/8
M:2/4
K:D
 Bc dc | dB D2 | GE B,E | G2 A2 :: GE B,E | FD DA | GE B,E | G2 A2 :|  