Compose a song based on the given alphabetical pattern and musical motif.
X:1
L:1/8
M:2/4
K:D
['Ad dB', 'f>g af']  
X:1
L:1/8
M:2/4
K:D
 A | Ad dB | Be eA | Ad dB | f3 A | Ad dB | Be eA | Ad dB | f4 |: f>g af | gf ed | f>g af | g2 e2 | 
 f>g af | gf ed | Ad dB |1 f4 :|2 f3 ||  