No-one can own a song (unless they wrote it themselves): but I can think of a few people who would be quite miffed and give you the "daggers" look if you sang "their" song.

All of which ties in well with what others were saying on your other thread, Andy7, about not going for songs that are too well-known/often sung or you may risk someone's nasal disjointedness - "oh, so-and-so ALWAYS does that one" - er, well not this time!

In this area it gets a bit hilarious around Burns time, when everyone is going to sing a Burns song at the session in the week of Jan 25th, and nobody knows who is going to sing what next: song-sheets and books go flying through the air as serially they are discarded when someone does the song you had planned to do and even your 2nd/3rd/4th reserve!