It might not be possible to find the least known song by any band, because of course if people don't know it they can't say so - if you see what I mean?

However, it's certainly possible to find examples of Beatles songs that are known only to their greatest fans or real music experts. The best way to get a selection of these is to type the words 'lesser known Beatles songs' in a search engine, and then explore the links. In this way you can find several lists of 'top 10 little known Beatles songs' or similar - this one is particularly interesting. I was surprised to see 'For No One' in this list, since it's definitely on a Beatles Ballads collection that I thought had been quite well known in its time, but it's true you hardly ever hear it on the radio.

Have a look at these and see if you know any of them. You may also be interested in the '10 worst Beatles songs' list on the right of the page!