What hard-/software does musicians use to do this?

http://9gag.tv/p/5waPj/pharrell-williams-happy-trombone-loop-cover-christopher-bill?ref=fbl9

What hard-/software does musicians use to do stuff like this?

If you find the original video he tells you

https://www.youtube.com/watch?feature=player_embedded&v=ZxODzxY6AvI#t=2

using ableton live 9

Aaah, i see. So it's simply an overdub and repeating function in a normal music production program?
Thanks a lot! :-)