1. How many seasons of Blood Ties have there been, 1 or 2?

This depends largely on where you live. In the US, the 12 episodes from 'Blood Price' through to 'Norman' were shown as Season 1, then 'DOA' to 'Deep Dark' were aired as Season 2. In the UK, the 22 episodes were shown as one complete season.

2. What is the theme music to Blood Ties?

'Live Forever' by Tamara Rhodes.

Re 2.
You can see a list of all music used in Blood Ties here:
http://www.bloodtiescentral.com/1music.shtml

Thanks Anne, that's really helpful :)