[Corporat]

I do not believe that having only three seconds of copyrighted music is any different than having any other amount of copyrighted music. You want to play it safe and not use any copyrighted music unless you have the proper permission to do so.

But a GarageBand rip-off, oddly enough, has worked for us in the past and I'm sure it is entirely acceptable as long as it is noticeably different (slightly different pitch, faster/slower tempo, different instrument, etc).