Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:2/2
K:Bb
['B2 bg (fdTc>B)', '(BGTF>E) DEFD']  
X:1
L:1/8
M:2/2
K:Bb
 F | B2 bg (fdTc>B) | AFcF dFcF | B2 bg (fdTc>B) | B,BAc dB B :: d | (BGTF>E) DEFD | ECCB cGGA | 
 (BGTF>E) DEFD | B,BAc dB B :|  