Segments of Audio

What program can I use to extract segments of songs so that I can fuse the segments together to make ONE mixed track? This would be for the purpose of constructing posing music for bodybuilding routines.

I’ve done it before with Adaptec Easy CD Creator 5 but that was on a different computer.

I currently have Nero burning suite 6. Will that work? - and it’s free.

Far better to author the mix-track first, than try to patch it together in the writing program.