What is the least information permitting a computer to identify any piece of music

I started a thread on this topic 8 years ago. I posted the approximate melody “ccdeca’G’CdecA’ccdEegAagageDcca’DDdcEcCageca’C.” In barely one hour I had my answer:

Thanks again, randomstar !
Clicking I see that that response to me is the and only post that randomstar ever made at SDMB. :eek: