Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
M:6/8
K:Bb
['F B2']  
X:1
L:1/8
M:6/8
K:Bb
 F | B2 BBAB | A2 G F2 F | B2 BcBc | d3 z2 B/d/ | f2 ffgf | f2 e c2 f | d2 dcBc | B3 f3 | 
 d2 dc>Bc | B3 z2 |]  