Wolfgang.....while I am sure that statistics can provide an answer to certain probabilities about the number of songs necessary to cover all the days and how many songs one would have to search if there WERE random distribution--based on pure chance--, I also suspect that certain aspects of the actual situation may skew the results. That is, since there are ONLY 365 days about which to write songs..(well, I do know a couple of songs about non-existant days..see below) and there have been so many hundreds of millions of human events which might be commemorated in song, I suspect that most days have at one time been covered! Now...whether these songs have been preserved, and whether there is any efficient way of locating them, remain awkward questions. Statistics may indeed tell me my chances of finding 365 from any particular current total..i.e 143 or 281, but I doubt that it can actually predict ACCURATELY the totals for each date or the total number of dates mentioned if all data were in...(And if all data WERE in, I suspect that a few songwriters would soon take it as a challenge to complete the list!!!)

"Oh we will all remember
That forty-fifth of May
For there were many gallant hearts
All filled with fear that day "

......from "The Cowboy Fireman"