Would adding a blog roundup be considered duplicate content?

Hi there,

This is perhaps going to sound a bit silly maybe but I wanted to make sure I knew what I was doing before I got started.

I have two websites, one of which is a blog and the other one is a company/shop page. They are both music related.

What I wanted to do was add a twice-weekly roundup of the blog posts onto the other website.

My question is would this negatively affect my search standing?

I know duplicate content has a negative affect but I just wanted to know at which point Google will regard this as duplicate content.

Thanks a lot in advance for your advice,
Dhy