Thank you Barbara.

I think a short attrubution is always polite...... who wrote the song (if known)and where you got it and any arrangement from. It's then down to style amd judgement.

I really don't like it when the intro becomes the feature and the song almost an after thought though. I once saw a set by a fairly well known singer who managed to get only 4 songs (not especially long ones!) into a 45 minute set and spent the rest of the time talking about them. I felt a bit cheated. He did better in the second half..... 5!