Craft a musical composition that incorporates the supplied alphabet sequence and motif.
X:1
L:1/4
M:3/4
K:G
['B, E2 E']  
X:1
L:1/4
M:3/4
K:G
 B, |S"Em" E2 E |"_B" [B,^D]3/2 ^C/ B, |"Em" E2 E |"B7" F2 F |"G" G2 G |"D" F3/2 E/ D |"G" G2 G | 
"D" A2 G/A/ |"G" B2 B |"Em" [eB]3/2 c/ B |"Am" [CA] A |"B7" [B,A] B ^d |"Em" e2 B |"Am" c3/2 B/ A | 
"Em/G" G2"B7" [B,^D] |"Em" E2!fine! || G/A/ |"G" B3/2 A/ B | G A B |"D" A2 G |"Bm" F3 | 
"Em" G3/2 F/ G |"C" [CE] F G |"B7" F2 B | B,2 B"^D.S. al fine" |]  