Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
M:3/4
K:G
['B2 ce e2 de cBgddg f2 z']  
X:1
L:1/8
M:3/4
K:G
 DB | B2 A2 Dc | c2 B2 DB | B2 A2 Dc | c2 B2 B2 | ce e2 de | cBgddg | f2 z c c2 | B4 B2 | 
 ce e2 de | cBgddg | f2 z c c2 | B4 |]  