PS3 Blu-ray start problem.

[GPRTech]

Hi this is my first post, I hope this is in the correct section.

I bought my first blu ray disk for my ps3
[Take that] the first time I viewed I saw all the different optrions , play concert, backstage, etc. I got to the first song and then had to stop as we had some friends arrive, now when I insert disc no matter what I try it starts from where it stopped, How do I start the disk from the begining so I see all the options again.
I do hope someone can help me sort this problem out.