Design a piece of music by fusing the provided alphabetic indicator and the predetermined tune.
X:1
L:1/8
M:2/4
K:Bb
['B2 z F ddcc']  
X:1
L:1/8
M:2/4
K:Bb
 d2 c c2 | B2 z F | ddcc | B2 z F | ddcc | BB f2 | ddcc | BB f2 | d2 cc | B2 z2 |]  