Why did Capulet think he heard Paris arriving while he was telling his servants to do more in setting up the wedding?

I'll let Capulet answer this. It's from Act 4 scene 4, the "cot-quean" scene:

Cap: Good Father, 'tis day. The County will be here with music straight, for so he said he would. I hear himnear.

I've added bolding to give you an extra hint.