Create music based on the specified alphabetic description of the musical arrangement and the given pattern.
X:1
L:1/8
M:4/4
K:Bb
['B3 G', 'B2 G2']  
X:1
L:1/8
M:4/4
K:Bb
 GBBG B3 G | Bcdc B2 G2 | GBBG B3 G | BBBB G2 F2 | GBBB B3 G | Bcdc B2 G2 | c4 e2 c2 | 
 B B2 (G G4) || G2 BB B2 G2 | B2 cc B2 G2 | c4 e2 c2 | B B2 (G G4) ||  