The first one is cute.
I love the second one very much as a small art piece, but I think it fails as a business card, because the person who wants to grab the business card at the end of a meeting has to wait for you to play the song first, and they can’t play it again once they heard it, unless they take it back to the person that gave it to them, but they can also just watch this video.
A lot of time and effort goes into something that is supposed to be a quick reference to your contact details. Also, how well does it fold into a wallet? I’m of the mindset that a designed piece should enhance or improve upon the piece’s function, not make it more complicated, unwieldy or difficult to use.
After I’ve been designing for as long as these two, I’m sure I’ll see things differently, but for now, viva ignorance!
