Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/16
M:4/4
K:Bb
['B3 B']  
X:1
L:1/16
M:4/4
K:Bb
 F4 | B3 B B3 B B4 D3 E | F3 G F2D2 B,4 d4 | c6 d2 c6 B2 | (A3 B) (G3 A) F4 (B3 c) | 
 d3 d (2:3:2d6 .d6 .c6 .B6 .c3 c (2:3:2c6 .c6 .B6 .A6 | .B3 B B3 B E4 D3 E | 
 F3 F F3 F F4 (3A6 .A6 .B6 .A6 .B6 .c6 | .d4 c3 c B4 ||  