How do I shorten a piece of music (for an audition)

[KatyMac]

I really need free software

& I am quite technically inept so it needs to be easy

Well done
You need to export it (I think as an MP3)

I converted it to a Wav file & saved it to the laptop - it should be easy to burn to CD

Fatal last words

Now we just need to buy a karaoke track for her to sing to & do the same

Well done
You're an expert now so next time should be easy!

This was not a skill I expected to have to gain to be a 'good mother'