Need a soft to cut/copy/paste musics

I need a soft to cut music parts. Then paste it as new track. Actually to make mix from musics. Please help, I need it very much

Thanks

Simple operations or complex ones?
Audacity is pretty simple


[edit: typo fixed]

Thanks, what about complex one?

soundforge
cubase
cakewalk
reason
screenblast

You figured it out i made a mistake. Of course it should be audacity

I used to DJ professionally (still mix a little in my free time) and for professional quality audio, I used Adobe Audition, Numark Cue or PCDJ.

These, of course, would fall into the "advanced" or "complex" category.

Thanks a lot