Thanks all for your considered responses.
This is very interesting
So what is familiar? And if it is familiar how did IT get familiar , all songs are unknown once upon a time, I remember when Police released 'De doo doo do de daa daa daa' I hated it with a passion, but i grew to like it, is it just exposure? if so wouldn't it be better to play ones own songs more and give them exposure?
So If I play 3 or 4 covers, which ones should I pick, the audience might not know any of them? and If I pick something like Space Oditty by Bowie, what can I bring to it? I've play that live before and got cheers and whooping but I guess it's directed not to me but for Bowie for writing a great song, I'm on the delivery guy, the reponse would be the same if Mr X from New York did it, or Miss Y from Frankfurt.
The other day I heard Skin by Maz o Connor for the first time, it's a brilliant piece of work in my view, I didn't need it to be familiar, I learned soo much from it.
I agree with the comments about covers improving technique, both in playing and delivery, when well delivered live they are an easy way to get appreciation and a feeling of what it's like to be 'famous' that is being clapped for something you have offered to strangers, I guess this is the drug that starts people on the road for fame...
With regards to songwriting, it's a dark art, but now I'm in this forum, I'm giving my work more attention, and taking the comments very seriously, adding and taking away, like a painter, until I'm happy with it, I'm not changing it to suit them, but using their comments constructively.
Thanks again.
CPM