Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:6/8
K:Bb
['f2 f e2 f', 'd3 c3']  
X:1
L:1/8
M:6/8
K:Bb
 B | d<de f2 f | e2 f d>dB | d>de f2 f | e2 f d2 f | f<dB B2 B | ede f2 g | f<(dd)B<dc | B2 B B2 || 
 B | d3 c3 | B2 B3 | d3 c3 | B3 B3 | d3 c3 | B3 B3 | d3 c3 | (B3 B2) ||  