Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
M:2/4
K:G
['BB/A/GG ABBA', 'B2 B/B/B/B/AG']  
X:1
L:1/8
M:2/4
K:G
|: BB/A/GG | ABBA | BB/A/GG | ABBA :: DDGG | AA B2 | B/B/B/B/AG | A/A/A/B/ AG | DDGG | AD B2 | 
 B/B/B/B/AG | AA G2 :|  