I doubt that anyone on Mudcat has less musical training or skill than I. Some songs take me weeks just to figure out the chords, and then months of practice before I would sing them with anyone else in the room. But there are other songs that I've learned in a day. The easy learners are usually popular songs (which may be what the NYD thread was looking for). Leonard Cohen's "Hallelujah" is the most recent example. I had heard it for years but never even sang along with it. Then one day I found some new lyrics that I liked. I learned it in less than an hour, sang it all day, and performed it for friends the next day.