4. The method according to claim 1 , wherein said constructing the tempo word set comprises: generating a fault-tolerant tempo word corresponding to each of the tempo words.
5. The method according to claim 4 , wherein said generating the fault-tolerant tempo word comprises: selecting one or more tempo scales contained in a corresponding tempo word; and replacing the selected tempo scales in said corresponding tempo word with corresponding fault-tolerant tempo scales to generate the fault-tolerant tempo word.