Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/4
M:3/4
K:Bb
['B,/C/ D F G', 'G F', 'G F']  
X:1
L:1/4
M:3/4
K:Bb
 B,/C/ | D F G | F D C | B,/ G,3/2 B,/C/ | D F G | D C3/2 B,/ | B,2 |: F/G/ | B c B | G F D | 
 G F B,/C/ | D F G | D C3/2 B,/ | B,2 :| B,/C/ | D F G | F D C | B,/ G,3/2 B,/C/ | D F G | 
 D C3/2 B,/ | B,2 F/G/ | B c B | G F D | G F F/G/ | B c B | G F D | G2 F/G/ | B c B | G F D | 
 C B, B,/C/ | D F G | D C3/2 B,/ | B,2 |]  