This was originally the song Telephone by Lady Gaga, but for years I've been using the tune to sing the 3's to my kids. Here's a free version of it for you to use in your classroom! I don't think Gaga use ukulele and guitar on her version, but I did.
*thumbnail image from 1001freedownloads.com
** this parody is for educational use, I do not profit from it.