The algorithms used may utilize simple statistical models based on sound energy or may involve sophisticated comb filter networks or other means. They may be fast enough to run in real time or may be so slow as to only be able to analyze short sections of songs.
Algorithms utilized could apply straightforward statistical models concerning sound energy, complex comb filter systems, or alternative methods. These algorithms might function swiftly for live processing or be exceedingly sluggish, suitable only for examining short portions of music.