How do I repeat a song twice?

I have a song that lasts for 2 minutes which is not enough time for what I want to do. Other than changing the song that plays for longer, I would like to play it again from the beginning without stopping and starting the song again. In other words, the song now lasts for 4 minutes on the one track.

It would be great if I could also "shave" off the introduction the second time around. If not, I am quite happy to just be able to repeat the song again for the 4 minutes.

Is this possible? Thank you for any help that I receive.